firebird-mirror/CHANGELOG.md

v4.0.5

Improvements

• #8181: Ensure the standalone CS listener on Linux uses the SO_REUSEADDR socket option
  Contributor(s): Dmitry Yemanov

• #8165: Added shutdown handler for Classic Server
  Contributor(s): Alexander Zhdanov

• #8104: More efficient evaluation of expressions like RDB$DB_KEY <= ? after mass delete
  Contributor(s): Vlad Khorsun

• #8066: Make protocol schemes case-insensitive
  Contributor(s): Vlad Khorsun

• #8042: Improve conflict resolution on replica when table have both primary and unique keys
  Contributor(s): Vlad Khorsun

• #8030: Better cardinality estimation when empty data pages exist
  Contributor(s): Vlad Khorsun

• #8010: Remove gfix -cache option
  Contributor(s): Vlad Khorsun

• #7978: Update Windows distributions with zlib version 1.3.1
  Contributor(s): Vlad Khorsun

• #7928: Make TempCacheLimit setting to be per-database, (not per-attachment) for SuperClassic
  Contributor(s): Vlad Khorsun

• #7854: Performance issue with time zones
  Contributor(s): Adriano dos Santos Fernandes, Vlad Khorsun

Bugfixes

• #8189: Slow connection times with a lot of simultaneous connections and active trace session present
  Contributor(s): Alexander Peshkov, Vlad Khorsun

• #8180: Sometimes a system trace session is terminated spontaneously
  Contributor(s): Artyom Abakumov

• #8178: Fix boolean conversion to string inside DataTypeUtil::makeFromList()
  Contributor(s): Dmitry Yemanov

• #8171: Trace plugin unloaded if called method is not implemented
  Contributor(s): Vlad Khorsun

• #8156: Can not specify concrete IPv6 address in ES/EDS connection string
  Contributor(s): Vlad Khorsun

• #8151: Deadlock happens when run 'List Trace Sessions' service and there are many active trace sessions
  Contributor(s): Vlad Khorsun

• #8150: Process could attach to the deleted instance of shared memory
  Contributor(s): Alexander Peshkov, Vlad Khorsun

• #8149: The hung or crash could happen when connection fires TRACE_EVENT_DETACH event and new trace session created concurrently
  Contributor(s): Vlad Khorsun

• #8138: Bugcheck when replicator state is changed concurrently
  Contributor(s): Vlad Khorsun

• #8120: CAST dies with numeric value is out of range error
  Contributor(s): Vlad Khorsun

• #8114: Segfault in connections pool during server shutdown
  Contributor(s): Vlad Khorsun

• #8110: Firebird crashes on Android API level 34
  Contributor(s): Vlad Khorsun

• #8108: ICU 63.1 suppresses conversion errors
  Contributor(s): Dmitry Kovalenko

• #8101: Firebird crashes if a plugin factory returns nullptr and no error in status
  Contributor(s): Vlad Khorsun, Dimitry Sibiryakov

• #8089: AV when attaching database while low of free memory
  Contributor(s): Vlad Khorsun

• #8085: Memory leak when executing a lot of different queries and StatementTimeout > 0
  Contributor(s): Vlad Khorsun

• #8083: AV when writting into internal trace log
  Contributor(s): Vlad Khorsun

• #8079: Engine could crash when executing some trigger(s) while another attachment modifies them
  Contributor(s): Vlad Khorsun

• #8077: Error "Too many recursion levels" does not stop execution of code that uses ON DISCONNECT trigger
  Contributor(s): Alexander Peshkov, Vlad Khorsun

• #8058: Replicated DDL changes do not set the correct grantor
  Contributor(s): Dmitry Yemanov

• #8056: Error "Too many temporary blobs" with blob_append when select a stored procedue using rows-clause
  Contributor(s): Vlad Khorsun

• #8040: Bugcheck 183 (wrong record length) could happen on replica database after UK violation on insert
  Contributor(s): Vlad Khorsun

• #8039: Segfault when opening damaged (last TIP is missing in RDB$PAGES, user's FW was OFF) database
  Contributor(s): Alexander Peshkov

• #8027: Broken gbak statistics
  Contributor(s): Alexander Peshkov

• #8011: DECFLOAT error working with INT128 in UDR
  Contributor(s): Alexander Peshkov

• #8006: Int128 datatype not supported in FB_MESSAGE macro
  Contributor(s): Alexander Peshkov

• #8003: gbak v4 can't backup database in ODS < 13
  Contributor(s): Vlad Khorsun

• #7997: Unexpected results when comparing integer with string containing value out of range of that integer datatype
  Contributor(s): Alexander Peshkov

• #7993: Unexpected results when using CASE WHEN with RIGHT JOIN
  Contributor(s): Dmitry Yemanov

• #7985: Hang in case of error when sweep thread is attaching to database (Classic Server) Contributor(s): Alexander Peshkov

• #7979: Hang when database with disconnect trigger using MON$ tables is shutting down
  Contributor(s): Alexander Peshkov

• #7969: Characters are garbled when replicating fields with type BLOB SUB_TYPE TEXT if the character set of the connection and the field are different
  Contributor(s): Dmitry Yemanov

• #7950: Unable to restore database when .fbk was created on host with other ICU
  Contributor(s): Alexander Peshkov

• #7927: Some default values is set incorrectly for SC/CS architectures
  Contributor(s): Vlad Khorsun

• #7917: Hang in case of error when sweep thread is attaching to database
  Contributor(s): Alexander Peshkov

• #7905: Segfault during TPC initialization
  Contributor(s): Alexander Peshkov

• #7899: Inconsistent state of master-detail occurs after RE-connect + 'SET AUTODDL OFF' + 'drop ' which is ROLLED BACK
  Contributor(s): Vlad Khorsun

• #7896: replication.log remains empty (and without any error in firebird.log) until concurrent FB instance is running under different account and generates segments on its master. Significant delay required after stop concurrent FB it in order allow first one to write in its replication log.
  Contributor(s): Vlad Khorsun

• #7885: Unstable error messages in services due to races related with service status vector
  Contributor(s): Alexander Peshkov

• #7873: Wrong memory buffer alignment and I/O buffer size when working in direct I/O mode
  Contributor(s): Vlad Khorsun

• #7869: gbak can write uninitialized data into RDB$RETURN_ARGUMENT and RDB$ARGUMENT_POSITION fields
  Contributor(s): Dmitry Kovalenko

• #7867: Error "wrong page type" during garbage collection on v4.0.4
  Contributor(s): Ilya Eremin

• #7860: Crash potentially caused by BETWEEN operator
  Contributor(s): Vlad Khorsun

• #7851: The skip of att_functionarg_field_precision does not check RESTORE_format
  Contributor(s): Dmitry Kovalenko

• #7846: FB4 can't backup/restore INT128-array
  Contributor(s): Dmitry Kovalenko

• #7844: Removing first column with SET WIDTH crashes isql
  Contributor(s): Adriano dos Santos Fernandes

• #7839: Potential bug in BETWEEN operator
  Contributor(s): Vlad Khorsun

• #7831: Incorrect type of UDF-argument with array
  Contributor(s): Dmitry Kovalenko

• #7827: Problem using Python firebird-driver with either Intel or M1 Mac builds with version 4.0.3 or 5.0+
  Contributor(s): Adriano dos Santos Fernandes

• #7809: Crash "Fatal lock manager error: Process disappeared in LockManager::acquire_shmem"
  Contributor(s): Alexander Peshkov

• #7800: Default publication status is not preserved after backup/restore
  Contributor(s): Dmitry Yemanov

• #7461: Differences in field metadata descriptions between Firebird 2.5 and Firebird 4
  Contributor(s): Dmitry Yemanov

v4.0.4

Improvements

• #7818: Extend RDB$GET_CONTEXT('SYSTEM', '***') with other info from MON$ATTACHMENTS
  Contributor(s): Vlad Khorsun

• #7755: Update Windows distribution with new zlib version 1.3 (released 2023-08-18)
  Contributor(s): Vlad Khorsun

Bugfixes

• #7817: Memory leak is possible for UDF array arguments
  Contributor(s): Dmitry Yemanov

• #7812: Service backup does not work in multiple engines configuration
  Contributor(s): Alexander Peshkov

• #7779: Firebird 4.0.3 is constantly crashing with the same symptoms (fbclient.dll) Contributor(s): Vlad Khorsun

• #7772: Blob corruption in FB4.0.3 (embedded)
  Contributor(s): Vlad Khorsun

• #7770: Restore takes 25% more time vs 4.0.0
  Contributor(s): Vlad Khorsun

• #7766: Firebird 4 Windows Installer omits DLLs during custom installation mode
  Contributor(s): Paul Reeves

• #7762: Crash on "Operating system call pthread_mutex_destroy failed. Error code 16" in log
  Contributor(s): Alexander Peshkov

• #7761: Regression when displaying line number of errors in ISQL scripts
  Contributor(s): Adriano dos Santos Fernandes

• #7759: Routine calling overhead increased by factor 6 vs Firebird 4.0.0
  Contributor(s): Adriano dos Santos Fernandes

• #7747: Fix an issue where the garbage collection in indexes and blobs is not performed in VIO_backout
  Contributor(s): Ilya Eremin

• #7745: Error restoring database which has system domains in user table with BLOBs using embedded connection
  Contributor(s): Alexander Peshkov

• #7738: Crash on multiple connections/disconnections
  Contributor(s): Alexander Peshkov

• #7737: Fix cases where the precedence relationship between a record page and a blob page is not set
  Contributor(s): Ilya Eremin

• #7731: Display length of TIMESTAMP WITH TIME ZONE is wrong in dialect 1
  Contributor(s): Alexander Peshkov

• #7730: Server ignores the size of VARCHAR when performing SET BIND ... TO VARCHAR(N)
  Contributor(s): Alexander Peshkov

• #7729: SET BIND OF TS WITH TZ TO VARCHAR(128) uses the date format of dialect 1
  Contributor(s): Alexander Peshkov

• #7727: Index for integer column cannot be used when INT128/DECFLOAT value is being searched
  Contributor(s): Dmitry Yemanov

• #7723: Wrong error message on login if the user doesn't exist and WireCrypt is disabled
  Contributor(s): Alexander Peshkov

• #7713: FOR SELECT statement can not see any changes made inside the DO block
  Contributor(s): Vlad Khorsun

• #7691: WITH CALLER PRIVILEGES has no effect in triggers
  Contributor(s): Alexander Peshkov

• #7480: Firebird server stops accepting new connections after some time
  Contributor(s): Alexander Peshkov

v4.0.3

Improvements

• #7542: Compiler warnings raise when build cloop-generated Firebird.pas in RAD Studio 11.3
  Contributor(s): Vlad Khorsun

• #7539: RDB$GET/SET_CONTEXT(): enclosing in apostrophes or double quotes of a missed namespace/variable will made output more readable
  Contributor(s): Vlad Khorsun

• #7494: Avoid non necessary index reads
  Contributor(s): Vlad Khorsun

• #7468: Add switch to control in guardian timeout before killing firebird server process
  Contributor(s): Alex Peshkoff

• #7437: Updated zlib to version 1.2.13 (released 2022-10-13)
  Contributor(s): Vlad Khorsun

• #7425: Add REPLICA MODE to the output of the isql SHOW DATABASE command
  Contributor(s): Dmitry Yemanov

• #7418: Improve reliability of plugin manager
  Contributor(s): Alex Peshkoff

• #7294: Allow FB-known macros in replication.conf
  Contributor(s): Dmitry Yemanov

• #7259: Remove TcpLoopbackFastPath and use of SIO_LOOPBACK_FAST_PATH
  Contributor(s): Vlad Khorsun

• #7186: Nbackup RDB$BACKUP_HISTORY cleanup
  Contributor(s): Vlad Khorsun

Bugfixes

• #7683: rdb$time_zone_util.transitions returns an infinite result set
  Contributor(s): Adriano dos Santos Fernandes

• #7670: Cursor name can duplicate parameter and variable names in procedures and functions
  Contributor(s): Adriano dos Santos Fernandes

• #7665: Wrong result ordering in LEFT JOIN query
  Contributor(s): Dmitry Yemanov

• #7664: DROP TABLE executed for a table with big records may lead to "wrong page type" or "end of file" error
  Contributor(s): Ilya Eremin

• #7662: Peformance issues in prepare_update()
  Contributor(s): Ilya Eremin

• #7661: FB CS rejects new connections
  Contributor(s): Vlad Khorsun

• #7651: Unable to find savepoint in insert with nested query and returning clause in FB4
  Contributor(s): Dmitry Yemanov

• #7638: OVERRIDING USER VALUE should be allowed for GENERATED ALWAYS AS IDENTITY
  Contributor(s): Adriano dos Santos Fernandes

• #7627: The size of the database with big records becomes bigger after backup/restore
  Contributor(s): Ilya Eremin

• #7626: Segfault when new attachment is done to shutting down database
  Contributor(s): Alex Peshkoff

• #7611: Can't backup/restore database from v3 to v4 with SEC$USER_NAME field longer than 10 characters
  Contributor(s): Adriano dos Santos Fernandes

• #7610: Uninitialized/random value assigned to RDB$ROLES.RDB$SYSTEM PRIVILEGES when restoring from FB3 backup
  Contributor(s): Adriano dos Santos Fernandes

• #7605: Disallow replication of RDB$BACKUP_HISTORY
  Contributor(s): Dmitry Yemanov

• #7604: PSQL functions do not convert the output BLOB to the connection character set
  Contributor(s): Adriano dos Santos Fernandes

• #7603: BIN_SHR on INT128 does not apply sign extension
  Contributor(s): Alex Peshkoff

• #7599: Conversion of text with '\0' to DECFLOAT without errors
  Contributor(s): Alex Peshkoff

• #7591: RELEASE SAVEPOINT ONLY works incorrectly
  Contributor(s): Dmitry Yemanov

• #7582: Missing isc_info_end in Firebird.pas
  Contributor(s): Alex Peshkoff

• #7579: Cannot nbackup a Firebird 3.0 database in Firebird 4.0 service with engine12 setup in Providers
  Contributor(s): Alex Peshkoff

• #7556: FB Classic can hang attempting to attach DB while it is starting to encrypt/decrypt
  Contributor(s): Alex Peshkoff

• #7555: Invalid configuration for random fresh created database may be used after drop of another one with alias in databases.conf
  Contributor(s): Alex Peshkoff

• #7548: SET BIND OF TIMESTAMP WITH TIME ZONE TO CHAR is not working with UTF8 connection charset
  Contributor(s): Adriano dos Santos Fernandes

• #7537: Wrong name in error message when unknown namespace is passed into RDB$SET_CONTEXT
  Contributor(s): Vlad Khorsun

• #7535: High CPU usage connect to Firebird 3 database using Firebird 4 Classic and SuperClassic service
  Contributor(s): Vlad Khorsun

• #7517: Successful compiling of procedure with wrong PLAN(s) used by some of its statement(s)
  Contributor(s): Dmitry Yemanov

• #7514: Segfault when detaching after deleting shadow on Classic
  Contributor(s): Alex Peshkoff

• #7510: Firebird regularly crashes soon after unload of udr_engine plugin
  Contributor(s): Alex Peshkoff

• #7501: Precision of a standalone unit may differ from a packaged one in SQL dialect 1
  Contributor(s): Vlad Khorsun

• #7499: Problem with restore (error: index cannot be used in the specified plan)
  Contributor(s): Vlad Khorsun

• #7488: Invalid real to string cast
  Contributor(s): Artyom Abakumov, Alex Peshkoff

• #7484: External engine SYSTEM not found
  Contributor(s): Adriano dos Santos Fernandes

• #7482: Result of blob_append(null, null) (literal '<null>') is not shown
  Contributor(s): Vlad Khorsun, Adriano dos Santos Fernandes

• #7473: Client application crash when processing callback requests from server during attachDatabase
  Contributor(s): Alex Peshkoff

• #7472: Window functions may lead to crash interacting with others exceptions
  Contributor(s): Adriano dos Santos Fernandes

• #7467: Simple SQL crashes Firebird: select cast(rdb$db_key as integer) from rdb$database
  Contributor(s): Alex Peshkoff

• #7465: Restore success illegally reported when gbak was unable to activate all indices
  Contributor(s): Alex Peshkoff

• #7456: Impossible drop function in package with name of PSQL-function
  Contributor(s): Adriano dos Santos Fernandes

• #7446: Attempt to use data in destroyed transaction pool
  Contributor(s): Alex Peshkoff

• #7444: isql crashes while executing test from QA suite
  Contributor(s): Alex Peshkoff

• #7415: DbCrypt/KeyHolder plugins key changing issues on running server
  Contributor(s): Alexey Mochalov

• #7402: Server crashes on startup error
  Contributor(s): Alex Peshkoff

• #7398: Worst plan sort created to execute an indexed tables
  Contributor(s): Dmitry Yemanov

• #7393: Access violation after double fault in attachDatabase()
  Contributor(s): Alex Peshkoff

• #7387: Unreliable replication behaviour in Linux Classic
  Contributor(s): Dmitry Yemanov

• #7380: Aliased blob variable with less restrictions makes text blob accept malformed string through BLOB_APPEND
  Contributor(s): Vlad Khorsun

• #7379: BLOB_APPEND with existing blob accepts malformed string
  Contributor(s): Vlad Khorsun, Adriano dos Santos Fernandes

• #7371: Various errors (fatal lock manager error, pthread_mutex_destroy failed) caused by races when opening/closing database
  Contributor(s): Alex Peshkoff

• #7370: Segfault under OOM conditions
  Contributor(s): Alex Peshkoff

• #7369: Build fails against re2 20220601
  Contributor(s): Adriano dos Santos Fernandes

• #7365: Client side aliases do not work in databases.conf
  Contributor(s): Alex Peshkoff

• #7361: Broken compacting of trace config storage
  Contributor(s): Alex Peshkoff

• #7359: Querying to list the running trace sessions can fail if two service API calls was done before it for a short time (Linux specifics)
  Contributor(s): Alex Peshkoff

• #7357: Lock manager error when connect a Firebird 3.0 database more than once using SuperClassic Firebird 4.0 service
  Contributor(s): Alex Peshkoff

• #7349: Contradictory licensing/distribution statements in several charset-support files
  Contributor(s): Mark Rotteveel

• #7314: Multitreaded activating indices restarts server process
  Contributor(s): Vlad Khorsun

• #7298: Unreliable info result parsing
  Contributor(s): Alex Peshkoff

• #7296: During shutdown op_disconnect may be sent to invalid handle
  Contributor(s): Alex Peshkoff

• #7295: Unexpected message 'Error reading data from the connection' when fbtracemgr is closed using Ctrl-C
  Contributor(s): Alex Peshkoff

• #7283: Suspicious error message during install
  Contributor(s): Alex Peshkoff

• #7276: Firebird 4 literal with CONTAINING crashes server
  Contributor(s): Vlad Khorsun

• #7271: Sporadic server crash
  Contributor(s): Vlad Khorsun

• #7262: Repeated op_batch_create leaks the batch
  Contributor(s): Alex Peshkoff

• #7256: Inconsistent conversion of non-TEXT blobs in BLOB_APPEND
  Contributor(s): Vlad Khorsun

• #7255: READ COMMITTED READ CONSISTENCY mode is broken in Classic / SuperClassic on Linux
  Contributor(s): Alex Peshkoff

• #7233: Slow database restore when Classic server mode is used
  Contributor(s): Ilya Eremin

• #7241: MacOS installer - firebird user is not created correctly if group already exists
  Contributor(s): Jonathan Frutos

• #7239: Connect using XNET protocol shows different exception (comparing to INET) if database is in the shutdown state
  Contributor(s): Vlad Khorsun

• #6941: Dummy (always true) conditions may change the join order
  Contributor(s): Dmitry Yemanov

• #4729: GRANT and REVOKE UPDATE (field)
  Contributor(s): Alex Peshkoff

v4.0.2

New features

• #6983: New built-in function BLOB_APPEND
  Reference(s): /doc/sql.extensions/README.blob_append.md
  Contributor(s): Vlad Khorsun

Improvements

• #7208: Trace: provide performance statistics for DDL statement
  Contributor(s): Vlad Khorsun

• #7194: Make it possible to avoid fbclient dependency in Pascal programs using firebird.pas
  Contributor(s): Alex Peshkoff

• #7168: Ignore missing UDR libraries during restore
  Contributor(s): Adriano dos Santos Fernandes

• #7161: Update zlib to version 1.2.12
  Contributor(s): Vlad Khorsun

• #7093: Improve indexed lookup speed of strings when the last keys characters are part of collated contractions
  Contributor(s): Adriano dos Santos Fernandes

• #7092: Improve performance of CURRENT_TIME
  Contributor(s): Adriano dos Santos Fernandes

• #7042: ON DISCONNECT triggers are not executed during forced attachment shutdown
  Contributor(s): Ilya Eremin

• #7041: Firebird port for Apple M1 architecture
  Contributor(s): Jonathan Frutos, Alex Peshkoff, Adriano dos Santos Fernandes

• #7038: Improve performance of STARTING WITH with insensitive collations
  Contributor(s): Adriano dos Santos Fernandes

• #6730: Trace: provide ability to see STATEMENT RESTART events (or their count)
  Contributor(s): Vlad Khorsun

Bugfixes

• #7243: Some UNICODE characters can lead to wrong CONTAINING evaluation when lower/upper uses different number of bytes in its encoding
  Contributor(s): Adriano dos Santos Fernandes

• #7229: ALTER COLUMN DROP IDENTITY does not reset generator name in metadata cache
  Contributor(s): Adriano dos Santos Fernandes

• #7222: Dependencies of packaged functions are not tracked
  Contributor(s): Adriano dos Santos Fernandes

• #7217: It's not allowed to execute DROP PACKAGE BODY for a package with a procedure even if a user has DROP ANY PACKAGE privilege
  Contributor(s): Ilya Eremin

• #7204: Segfault in GBAK when restoring a broken backup file over the wire
  Contributor(s): Alex Peshkoff

• #7202: ISQL -ch utf8 (Windows only): either silently quits to OS or issues non-expected 'malformed string' when non-ASCII character occurs in the typed command
  Contributor(s): Adriano dos Santos Fernandes

• #7200: DROP DATABASE leads to hang if it is issued while database encrypting/decrypting is in progress
  Contributor(s): Alex Peshkoff

• #7199: Various errors (strange messages in firebird.log, segfaults) with high rate of attach/detach database operations
  Contributor(s): Alex Peshkoff

• #7197: Segfault in Linux CS after successful detach from database
  Contributor(s): Alex Peshkoff

• #7194: GSTAT fails but returns 0 as error code if incorrect databases.conf is used
  Contributor(s): Alexey Mochalov

• #7188: Memory leak in fbclient when a multi-database transaction is used
  Contributor(s): Alex Peshkoff

• #7184: GBAK output is not being flushed to disk
  Contributor(s): Alex Peshkoff

• #7179: Wrong error message - "string right truncation. expected length 30, actual 30."
  Contributor(s): Adriano dos Santos Fernandes

• #7178: DEFAULTed grants to PUBLIC must act as DEFAULTed to every user
  Contributor(s): Roman Simakov

• #7176: Incorrect error "Invalid token. Malformed string." with UNION + blob + non-UTF8 varchar
  Contributor(s): Adriano dos Santos Fernandes

• #7167: Incorrect transliteration of field names in constraint violation errors
  Contributor(s): Adriano dos Santos Fernandes

• #7160: Missing checkout in the trace manager when performing user mapping may cause server hang
  Contributor(s): Alex Peshkoff

• #7150: Replication not restarting after network failure
  Contributor(s): Dmitry Yemanov

• #7147: Problems with use of big timeout (or no timeout at all) in the trace service
  Contributor(s): Alex Peshkoff

• #7141: Services manager breaks long lines into 1023 bytes portions when using isc_info_svc_line in Service::query()
  Contributor(s): Adriano dos Santos Fernandes

• #7140: Wrong select result in case of special sort character
  Contributor(s): Adriano dos Santos Fernandes

• #7139: With multiple trace sessions user may receive trace events related to engine's requests
  Contributor(s): Alex Peshkoff

• #7138: Problems accessing FB4 database, copied from another host
  Contributor(s): Alex Peshkoff

• #7135: Firebird engine randomly fails when delivering mapping clear signal to other processes
  Contributor(s): Alex Peshkoff

• #7134: Database page errors directly after GBAK, dissappearing after some calls of GFIX
  Contributor(s): Vlad Khorsun

• #7129: Cannot alter SQL SECURITY on package
  Contributor(s): Alexey Mochalov

• #7128: Incorrect error message with isc_sql_interprete()
  Contributor(s): Vlad Khorsun

• #7124: Inconsistent RDB$USER_PRIVILEGES after dropping identity
  Contributor(s): Adriano dos Santos Fernandes

• #7123: ISQL does not extract INCREMENT BY for IDENTITY column
  Contributor(s): Adriano dos Santos Fernandes

• #7122: Invalid state of mapping cache after replacement of database
  Contributor(s): Alex Peshkoff

• #7121: Mapping error when server tries to use mapping rules from database in full shutdown mode
  Contributor(s): Alex Peshkoff

• #7119: Database statistics service could not find existing table(s)
  Contributor(s): Vlad Khorsun

• #7118: Chained JOIN .. USING across the same column names may be optimized badly
  Contributor(s): Dmitry Yemanov

• #7113: Wrong path in Object Pascal's readme.md
  Contributor(s): Alex Peshkoff

• #7112: Avoid unload of plugins in MacOS due to problematic reload of them
  Contributor(s): Adriano dos Santos Fernandes

• #7108: Firebird does not find an record when adding a foreign key
  Contributor(s): Adriano dos Santos Fernandes

• #7106: Wrong detection of must-be-delimited user names
  Contributor(s): Alex Peshkoff

• #7103: FB service hangs after several DELETE FROM MON$STATEMENTS being issued in order to stop ES/EDS which waits record for updating
  Contributor(s): Vlad Khorsun

• #7099: Incomplete op_batch_cs response with TAG_MULTIERROR
  Contributor(s): Alex Peshkoff

• #7096: Client install on Windows is missing some files
  Contributor(s): Paul Reeves

• #7094: Incorrect indexed lookup of strings when the last keys characters are part of collated contractions and there is multi-segment insensitive descending index
  Contributor(s): Adriano dos Santos Fernandes

• #7090: Performance degradation with CURRENT_DATE, LOCALTIME and LOCALTIMESTAMP
  Contributor(s): Adriano dos Santos Fernandes

• #7088: MacOS UDR and Legacy_UserManager plugins not working due to not exported entry point
  Contributor(s): Adriano dos Santos Fernandes

• #7084: Creating unique constraints on MacOS fails on larger tables
  Contributor(s): Adriano dos Santos Fernandes

• #7080: Executing batch crashes the server
  Contributor(s): Alex Peshkoff

• #6947: Query to MON$ tables does not return data when database encryption/decryption is in progress
  Contributor(s): Alex Peshkoff

• #4085: RDB$INDICES information stored inconsistently after a CREATE INDEX
  Contributor(s): Dmitry Yemanov

• #3357: Bad execution plan if some stream depends on multiple streams via a function
  Contributor(s): Dmitry Yemanov

v4.0.1

New features

• #6910: Add way to retrieve statement BLR with Statement::getInfo and ISQL's SET EXEC_PATH_DISPLAY BLR
  Contributor(s): Adriano dos Santos Fernandes

Improvements

• #6959: Add IBatch::getInfo() method to the API
  Contributor(s): Alex Peshkoff

• #6954: fb_info_protocol_version support
  Contributor(s): Alex Peshkoff

• #6929: Add support of PKCS v.1.5 padding to RSA functions, needed for backward compatibility with old systems
  Contributor(s): Alex Peshkoff

• #6915: Allow attribute DISABLE-COMPRESSIONS in UNICODE collations
  Contributor(s): Adriano dos Santos Fernandes

• #6903: Make it possible to create ICU-based collations with locales keywords
  Contributor(s): tkeinz, Adriano dos Santos Fernandes

• #6872: Faster indexed STARTING WITH execution with UNICODE collations
  Contributor(s): Adriano dos Santos Fernandes

• #6810: Use precise limit of salt length when signing messages and verifying the sign
  Contributor(s): Alex Peshkoff

• #6809: Integer hex-literal support for INT128
  Contributor(s): Alex Peshkoff

Bugfixes

• #7070: Error "BLOB is not found" while replication converts INSERT into UPDATE for a conflicting record
  Contributor(s): Dmitry Yemanov

• #7068: Errors in the ChaCha plugin are displayed incorrectly
  Contributor(s): Alex Peshkoff

• #7067: Deadlock when using not initialized security database
  Contributor(s): Alex Peshkoff

• #7066: Server may send incorrect specific data to client when establishing encrypted connection
  Contributor(s): Alex Peshkoff

• #7065: Connection hangs after delivery of 256GB of data
  Contributor(s): Alex Peshkoff

• #7064: Linear regression functions aren't implemented correctly
  Contributor(s): Adriano dos Santos Fernandes

• #7062: Creation of expression index does not release its statement correctly
  Contributor(s): Adriano dos Santos Fernandes

• #7060: Deadlock when execute test for CORE-4337
  Contributor(s): Alex Peshkoff

• #7057: Client-side positioned updates work wrongly with scrollable cursors
  Contributor(s): Dmitry Yemanov

• #7056: Fetching from a scrollable cursor may overwrite user-specified buffer and corrupt memory
  Contributor(s): Dmitry Yemanov

• #7052: Races between transactions on the primary side may cause update conflicts while applying journals to the replica
  Contributor(s): Dmitry Yemanov

• #7048: Incorrect releasing of user savepoint (older savepoints become inaccessible)
  Contributor(s): Dmitry Yemanov

• #7043: Wrong message when user has no access to /tmp/firebird
  Contributor(s): Alex Peshkoff

• #7037: Build problem when using both --with-builtin-tommath and --with-builtin-tomcrypt
  Contributor(s): Adriano dos Santos Fernandes

• #7034: Server crashes while fetching from a scrollable cursor in PSQL
  Contributor(s): Dmitry Yemanov

• #7033: Replicator is missing sanity checks for user-supplied blocks
  Contributor(s): Dmitry Yemanov

• #7018: Problems with windows frames
  Contributor(s): Adriano dos Santos Fernandes

• #7015: Replication applier code may crash if the specified block contains no savepoint operations
  Contributor(s): Dmitry Yemanov

• #6998: Problems with access to RDB$CONFIG table for non-privileged user when he has grant on execution of SP which has necessary access rights (created by SYSDBA with SQL DEFINER clause)
  Contributor(s): Roman Simakov

• #6995: "String truncation error" is raised while restoring the database from a v2.5 backup
  Contributor(s): Dmitry Yemanov

• #6989: Invalid message in replication.log (and possibly crash in the case of synchronous replication) when the target DB has no "replica" flag set
  Contributor(s): Dmitry Yemanov

• #6985: Application could hang when using new Batch API with blobs over XNET
  Contributor(s): Vlad Khorsun

• #6979: Windows x64 server installer installs an incomplete x86 client Contributor(s): Paul Reeves

• #6978: Firebird 4 fails to build on big endian platforms
  Contributor(s): Alex Peshkoff

• #6976: Lack of proper clean up after failure to initialize shared memory
  Contributor(s): Vlad Khorsun

• #6975: Crash or hang while shutting down the replica database if segments are being applied
  Contributor(s): Dmitry Yemanov

• #6968: On Windows, engine may hang when works with corrupted database and read after the end of file
  Contributor(s): Vlad Khorsun

• #6966: Status vector for ES(<EMPTY_STRING>) is unstable if another execute block with correct statement was executed before. Affects only LINUX builds in Classic mode
  Contributor(s): Alex Peshkoff

• #6963: The REFERENCES permission does not work
  Contributor(s): Alex Peshkoff

• #6955: fb_info_creation_timestamp_tz returns a corrupted buffer
  Contributor(s): Vlad Khorsun

• #6945: Segfault in the batch interface when gbak restores a database with many blobs over the wire
  Contributor(s): Alex Peshkoff

• #6943: Windows client install is missing some DLLs Contributor(s): Paul Reeves

• #6935: SQL SECURITY DEFINER has inconsistent behaviour if the object owner is non-privileged
  Contributor(s): Dmitry Yemanov

• #6935: SQL SECURITY DEFINER does not affect the ownership of created DDL objects
  Contributor(s): Dmitry Yemanov

• #6930: Segfault when calling cryptographic functions
  Contributor(s): Alex Peshkoff

• #6917: Firebird 4 installer asks for SYSDBA password when doing client installation Contributor(s): Paul Reeves

• #6913: Buffer overflows in getInfo APIs
  Contributor(s): Adriano dos Santos Fernandes

• #6909: Some updates may crash Firebird server on the replica side
  Contributor(s): Dmitry Yemanov

• #6907: Failed DDL commands can be replicated
  Contributor(s): Dmitry Yemanov

• #6900: IBatch::add() method fails silently when a memory limit is exceeded
  Contributor(s): Alex Peshkoff

• #6893: Problem with replication of BLOB segments longer than 32KB
  Contributor(s): Dmitry Yemanov

• #6887: Invalid SIMILAR TO patterns may lead memory read beyond string limits
  Contributor(s): Adriano dos Santos Fernandes

• #6886: Differerent interfaces behaviour depending upon source of interface
  Contributor(s): Alex Peshkoff

• #6887: Significant performance regression of SIMILAR TO and SUBSTRING(SIMILAR) when pattern is taken from a variable
  Contributor(s): Adriano dos Santos Fernandes

• #6874: Literal 65536 (interpreted as int) cannot be multiplied by itself w/o cast if result is more than 2^63-1
  Contributor(s): Alex Peshkoff

• #6860: Create user statement fails with SQLSTATE = HY000 when using DataTypeCompatibility
  Contributor(s): Alex Peshkoff

• #6856: Permission error after replication of DDL commands
  Contributor(s): Dmitry Yemanov

• #6853: Asynchronous replication leaks file handles
  Contributor(s): Dmitry Yemanov

• #6850: Database-level and DDL triggers are executed at the replica side
  Contributor(s): Dmitry Yemanov

• #6849: Conflicting INSERT propagated into a read-write replica may cause duplicate records to appear (and PK/UK violation to happen)
  Contributor(s): Dmitry Yemanov

• #6848: Generator values may not replicate after commit
  Contributor(s): Dmitry Yemanov

• #6845: Result type of AVG over BIGINT column results in type INT128
  Contributor(s): Alex Peshkoff

• #6838: Deleting multiple rows from a view with triggers may cause triggers to fire just once
  Contributor(s): Dmitry Yemanov

• #6832: Segfault when using COMMIT RETAINING with Global Temporary Tables
  Contributor(s): Alex Peshkoff

• #6801: Error recompiling a package with some combination of nested functions
  Contributor(s): Adriano dos Santos Fernandes

v4.0 Release (01-Jun-2021)

Improvements

• #6806: Rename RSA_SIGN and RSA_VERIFY
  Reference(s): /doc/sql.extensions/README.builtin_functions.txt, /doc/sql.extensions/README.keywords
  Contributor(s): Alex Peshkoff

• #6786: Add session time zone to system context
  Reference(s): /doc/sql.extensions/README.time_zone.md, /doc/sql.extensions/README.context_variables2
  Contributor(s): Adriano dos Santos Fernandes

• #6769: More efficient implementation of SUBSTRING for UTF8 character set
  Contributor(s): Adriano dos Santos Fernandes

• #6767: Add ability for a replication plugin to refuse attachment
  Contributor(s): Dmitry Yemanov

• #6748: Freeing a statement using DSQL_drop or DSQL_unprepare should send free packet immediately
  Contributor(s): Vlad Khorsun

• #6715: Provide time zone ID constants in public headers
  Contributor(s): Adriano dos Santos Fernandes

• #6253: RDB$GET_TRANSACTION_CN should work the same way in Super and Classic
  Contributor(s): Vlad Khorsun

Bugfixes

• #6816: Illegal output length in base64/hex encode/decode functions
  Contributor(s): Alex Peshkoff

• #6812: BASE64_ENCODE and HEX_ENCODE can exceed maximum widths for VARCHAR
  Contributor(s): Alex Peshkoff

• #6808: Segfault in encrypt/decrypt functions when their first argument is NULL
  Contributor(s): Alex Peshkoff

• #6805: RDB$TYPES has incorrect entries for RDB$TYPE 28 and 29 in RDB$TYPE_NAME column
  Contributor(s): Alex Peshkoff

• #6804: Assertion in tomcrypt when key length for RC4 is too small
  Contributor(s): Alex Peshkoff

• #6802: When the statement timeout is set, it causes the lock manager to delay reporting deadlocks until timeout is expired
  Contributor(s): Vlad Khorsun

• #6800: Client config DefaultTimeZone is not passed to server when isc_dpb_session_time_zone is not set
  Contributor(s): Adriano dos Santos Fernandes

• #6797: Functions DECRYPT and RSA_DECRYPT return VARCHAR CHARACTER SET NONE instead of VARBINARY (VARCHAR CHARACTER SET OCTETS)
  Contributor(s): Alex Peshkoff

• #6796: Buffer overflow when padding line with national characters causes ISQL to crash
  Contributor(s): Adriano dos Santos Fernandes

• #6795: Replication gets stuck due to "Blob xxx.xx is not found for table xxx" error
  Contributor(s): Dmitry Yemanov

• #6790: MON$ATTACHMENTS.MON$TIMESTAMP is incorrect when DefaultTimeZone is configured with time zone different from the server's default
  Contributor(s): Adriano dos Santos Fernandes

• #6787: MON$ATTACHMENTS.MON$TIMESTAMP should use its session original time zone
  Contributor(s): Adriano dos Santos Fernandes

• #6785: Problem when restoring the database on Firebird 4 RC1
  Contributor(s): Vlad Khorsun

• #6782: Cannot get "records fetched" for selectable procedures in trace
  Contributor(s): Vlad Khorsun

• #6781: Crashing (due to UDF exception) process hangs
  Contributor(s): Vlad Khorsun

• #6780: firebird.msg is missing in Firebird Android builds
  Contributor(s): Alex Peshkoff

• #6778: Inconsistent cursor-driven deletion
  Contributor(s): Dmitry Yemanov

• #6777: AV when the engine shuts down and cancels an attachment waiting in the lock manager
  Contributor(s): Vlad Khorsun

• #6768: Restore backup on RawDevice (error during "open O_CREAT" operation for file "/dev/sda1")
  Contributor(s): Alex Peshkoff

• #6766: Replication plugin can crash engine returning nullptr from startTransaction() method
  Contributor(s): Dmitry Yemanov

• #6761: Hash join cannot match records using some TIME ZONE / DECFLOAT keys
  Contributor(s): Dmitry Yemanov

• #6759: Results of concatenation with blob has no info about collation of source columns (which are declared with such info)
  Contributor(s): Vlad Khorsun

• #6758: COMPUTED BY column looses charset and collate of source field when is either of type BLOB or VARCHAR casted to BLOB
  Contributor(s): Vlad Khorsun

• #6756: Error "no current record for fetch operation" when sorting by a international string
  Contributor(s): Dmitry Yemanov

• #6754: Connect to database that contains broken pages can lead to FB crash
  Contributor(s): Alex Peshkoff

• #6753: AV in the engine when StatementTimeout is active for user statement and some internal DSQL statement was executed as part of overall execution process
  Contributor(s): Vlad Khorsun

• #6752: Segfaults in fbclient when receiving invalid / unexpected data from server
  Contributor(s): Alex Peshkoff

• #6751: Various segfaults in fbclient
  Contributor(s): Alex Peshkoff

• #6750: CAST of Infinity values to FLOAT doesn't work
  Contributor(s): Alex Peshkoff

• #6749: Error "Invalid time zone (+08). Falling back to displacement" in firebird.log
  Contributor(s): Adriano dos Santos Fernandes

• #6747: Wrong message when connecting to tiny trash database file
  Contributor(s): Alex Peshkoff

• #6746: Regression: CREATE DATABASE fails with 'Token unknown' error when DB name is enclosed in double quotes and 'DEFAULT CHARACTER SET' is specified after DB name
  Contributor(s): Adriano dos Santos Fernandes

• #6745: Protect included tomcrypt library from being overwritten by a system package
  Contributor(s): Alex Peshkoff

• #6738: Segfault when GFIX requests for database page buffer more memory than available from OS
  Contributor(s): Alex Peshkoff

• #6734: Provide same results for date arithmetics when date is changed by values near +/-max(bigint)
  Contributor(s): Alex Peshkoff

• #6733: Attempt to create database with page_size >= 65536 makes DB with actual page size = 4KB or 8KB, but not 32KB as it should
  Contributor(s): Alex Peshkoff

• #6731: Segfault when shutting down database which got encrypted by another process
  Contributor(s): Alex Peshkoff

• #6729: Regression: GSTAT with switch -t executed via services fails with "found unknown switch" error
  Contributor(s): Alex Peshkoff

• #6727: Synchronous replication to localhost hangs on disconnect
  Contributor(s): Dmitry Yemanov

• #6724: Inconsistent translation "string->timestamp->string->timestamp" in Dialect 1
  Contributor(s): Adriano dos Santos Fernandes

• #6719: User without ALTER ANY ROLE privilege can use COMMENT ON ROLE
  Contributor(s): Alex Peshkoff

• #6718: Event delivery could be missed when local (XNET) protocol is used
  Contributor(s): Vlad Khorsun

• #6717: FETCH ABSOLUTE and RELATIVE beyond bounds of cursor should always position immediately before-first or after-last
  Contributor(s): Dmitry Yemanov

• #6716: FETCH RELATIVE has an off by one error for the first row
  Contributor(s): Dmitry Yemanov

• #6710: COMMENT ON USER can only apply comment on user defined by the default user manager plugin
  Contributor(s): Alex Peshkoff

• #6709: GBAK discards replica mode during backup/restore
  Contributor(s): Dmitry Yemanov

• #6708: Rare race condition in Plugin Manager could lead to the server crash
  Contributor(s): Vlad Khorsun

• #6700: Wire compression causes sporadic "Error reading data from the connection" errors
  Contributor(s): Alex Peshkoff

• #6698: Comments before the first line of code are removed
  Contributor(s): Adriano dos Santos Fernandes

• #6679: CLOOP envelopes are wrong regarding IStatus
  Contributor(s): Alex Peshkoff

• #6265: Segfault when using expression index with complex expression
  Contributor(s): Vlad Khorsun

• #5784: When 32-bit and 64-bit Firebird 3 servers run on a single Windows machine concurrently, Firebird services freeze several minutes after first disconnect
  Contributor(s): Vlad Khorsun

• #3810: Wrong or missing IS NULL optimization (regression)
  Contributor(s): Vlad Khorsun

• #3106: Many indexed reads in a compound index with NULLs
  Contributor(s): Vlad Khorsun

• #2469: Stored procedure recursively called by calculated field fails after reconnect
  Contributor(s): Vlad Khorsun

v4.0 Release Candidate 1 (01-Feb-2021)

New features

• CORE-5832: Add command to reset user session environment to its initial (default) state
  Contributor(s): Vlad Khorsun

• CORE-3708: Add virtual table RDB$CONFIG that shows actual configuration settings
  Contributor(s): Vlad Khorsun

Improvements

• CORE-6474: Report replica mode through isc_database_info, MON$DATABASE and SYSTEM context
  Contributor(s): Dmitry Yemanov

• CORE-6469: Ability to trace session management commands (e.g. ALTER SESSION RESET)
  Contributor(s): Vlad Khorsun

• CORE-6429: Timezone offset in timestamp/time literal, CAST, SET TIME ZONE and AT TIME ZONE should follow SQL standard syntax only
  Reference(s): /doc/sql.extensions/README.time_zone.md
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6413: Remove PIDFile/-pidfile directive/option from firebird Super(Server/Classic) systemd unit
  Contributor(s): Alex Peshkoff

• CORE-6395: Allow usage of time zone displacement in config DefaultTimeZone
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6366: Check presence of tomcrypt & curses libraries before installing Firebird
  Contributor(s): Alex Peshkoff

• CORE-6342: INT128 as explicit basic type for high precision numerics
  Reference(s): /doc/sql.extensions/README.data_types
  Contributor(s): Alex Peshkoff

• CORE-6320: Replace Util methods to get interface pointer by legacy handle with plain functions
  Contributor(s): Alex Peshkoff

• CORE-6308: Make it possible to update list of time zones (names and ids) without source code recompilation
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6300: Ability to retrieve next attachment id and next statement id
  Reference(s): /doc/README.monitoring_tables
  Contributor(s): Dmitry Yemanov

• CORE-5085: Allow to fixup (nbackup) database via Services API
  Reference(s): /doc/README.services_extension
  Contributor(s): Alex Peshkoff

• CORE-4841: Report explicit message about missing password in CREATE (OR ALTER) USER
  Contributor(s): Alex Peshkoff

• CORE-2650: Improve sorting performance when long VARCHARs are involved
  Contributor(s): Dmitry Yemanov

Bugfixes

• CORE-6475: Memory leak when running EXECUTE STATEMENT with named parameters
  Contributor(s): Vlad Khorsun

• CORE-6472: Wrong byte order for UUIDs in gstat and monitoring output
  Contributor(s): Dmitriy Sibiryakov

• CORE-6460: Incorrect query result when using named window
  Contributor(s): Vlad Khorsun

• CORE-6453: EXECUTE STATEMENT fails on FB 4.x if containing time/timestamp with time zone parameters
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6450: Races in the security databases cache could lead to the server crash
  Contributor(s): Alex Peshkoff

• CORE-6447: Unexpectedly different text of message for parameterized expression starting from second run
  Contributor(s): Vlad Khorsun

• CORE-6441: Srp plugin keeps connection after database has been removed for ~10 seconds
  Contributor(s): Alex Peshkoff

• CORE-6440: Expression indexes containing COALESCE inside cannot be matched by the optimizer after migration from v2.5 to v3.0
  Contributor(s): Dmitry Yemanov

• CORE-6438: ISQL: bad headers when text columns has >= 80 characters
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6437: GFIX cannot set big value for page buffers
  Contributor(s): Vlad Khorsun

• CORE-6433: Server could crash during a daily maintenance / set statistics index
  Contributor(s): Alex Peshkoff

• CORE-6432: Possible buffer overflow in client library in Attachment::getInfo() call
  Contributor(s): Alex Peshkoff

• CORE-6427: Whitespace as date separator causes conversion error
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6426: Assertion when the batch is executed without a BLOB field
  Contributor(s): Alex Peshkoff

• CORE-6425: Exception in client library in IAttachment::createBatch()
  Contributor(s): Alex Peshkoff

• CORE-6421: Parameter in offset expression in LAG, LEAD, NTH_VALUE window functions requires explicit cast to BIGINT or INTEGER
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6419: Truncation of strings to put in MON$ tables do not work correctly
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6415: Error "malformed string' is raised instead of "expected: N, actual: M" when UTF-8 charset is used and default value is longer than the column length
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6414: Error "expected length N, actual M" contains wrong value of M when UTF-8 charset is used in the field declaration
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6412: Firebird was freezing when trying to manage users via triggers
  Contributor(s): Alex Peshkoff

• CORE-6408: RETURNING clause in the MERGE statement cannot reference column in aliased target table using qualified reference (alias.column) if DELETE action present
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6403: Some PSQL statements may lead to exceptions report wrong line/column
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6398: Error converting string with hex representation of INTEGER to SMALLINT
  Contributor(s): Alex Peshkoff

• CORE-6397: Message length error with COALESCE and TIME/TIMESTAMP WITHOUT TIME ZONE and WITH TIME ZONE
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6389: Using binary string literal to assign to user-defined blob sub-types yield conversion error
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6387: Client process was aborting due to bugs inside the ChaCha plugin Contributor(s): Alex Peshkoff

• CORE-6386: ALTER SEQUENCE RESTART WITH should not change the initial sequence START value
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6385: Wrong line and column information after IF statement
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6379: Bugcheck 179 (decompression overran buffer)
  Contributor(s): Vlad Khorsun

• CORE-6377: Unable to restore database with tables using GENERATED ALWAYS AS IDENTITY columns
  Contributor(s): Alex Peshkoff

• CORE-6376: IDENTITY column with explicit START WITH or INCREMENT BY starts with wrong value
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6357: LEAD() and LAG() do not allow to specify 3rd argument of INT128 datatype
  Contributor(s): Alex Peshkoff

• CORE-6356: ROUND() does not allow second argument >=1 when its first argument is more than MAX_BIGINT / 10
  Contributor(s): Alex Peshkoff

• CORE-6355: TRUNC() does not accept second argument = -128 (but shows it as required boundary in error message)
  Contributor(s): Alex Peshkoff

• CORE-6353: INT128 data type has problems with some PSQL objects
  Contributor(s): Alex Peshkoff

• CORE-6344: Invalid return type for functions with INT128 / Numeric(38) argument
  Contributor(s): Alex Peshkoff

• CORE-6337: Sub-type information is lost when calculating arithmetic expressions
  Contributor(s): Alex Peshkoff

• CORE-6336: Error "Implementation of text subtype not located" on attempt to use some collations defined in fbintl.conf
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6335: INSERT ... RETURNING does not require a SELECT privilege
  Contributor(s): Dmitry Yemanov

• CORE-6328: FB4 Beta 2 may still be using the current date for TIME WITH TIME ZONE and extended wire protocol
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6325: NTILE/RANK/PERCENT_RANK may cause problems in big/complex statements
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6318: CAST('NOW' as TIME) raises a conversion error
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6316: Unable to specify new 32KB page size in CREATE DATABASE statement
  Contributor(s): Alex Peshkoff

• CORE-6305: Android port build failure
  Contributor(s): Alex Peshkoff

• CORE-6303: Error writing to TIMESTAMP/TIME WITH TIME ZONE array
  Contributor(s): Alex Peshkoff

• CORE-6302: Error writing an array of NUMERIC(24,6) to the database
  Contributor(s): Alex Peshkoff

• CORE-6084: CREATE SEQUENCE START WITH has wrong initial value
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6023: FB4 is unable to overwrite older ODS database
  Contributor(s): Alex Peshkoff

• CORE-5838: Rotated trace files are locked by the engine
  Contributor(s): Vlad Khorsun

• CORE-4985: A non-privileged user could implicitly count records in a restricted table
  Contributor(s): Dmitry Yemanov

• CORE-2274: MERGE has a non-standard behaviour, accepts multiple matches
  Contributor(s): Vlad Khorsun

v4.0 Beta 2 (14-May-2020)

New features

• CORE-6287: SET BIND OF type1 TO type2
  Reference(s): /doc/sql.extensions/README.set_bind.md
  Contributor(s): Alex Peshkoff

• CORE-6285: SQL-level replication management
  Reference(s): /doc/README.replication.md, /doc/sql.extensions/README.ddl.txt
  Contributor(s): Dmitry Yemanov

• CORE-6109: Changed FLOAT to a SQL standard compliant FLOAT datatype
  Reference(s): /doc/sql.extensions/README.floating_point_types.md
  Contributor(s): Mark Rotteveel

• CORE-6018: Make it possible to start multiple transactions (possibly in different attachments) using the same initial transaction snapshot
  Reference(s): /doc/README.transaction_at_snapshot.md
  Contributor(s): Adriano dos Santos Fernandes

• CORE-4933: Add better transaction control to ISQL
  Reference(s): /doc/README.isql_enhancements.txt
  Contributor(s): Vlad Khorsun

• CORE-3435: Lateral derived tables
  Reference(s): /doc/sql.extensions/README.derived_tables.txt
  Contributor(s): Dmitry Yemanov

Improvements

• CORE-6286: Make usage of TIMESTAMP/TIME WITH TIME ZONE convenient for users when appropriate ICU library is not installed on the client side
  Reference(s): /doc/sql.extensions/README.time_zone.md, /doc/sql.extensions/README.set_bind.md
  Contributor(s): Alex Peshkoff

• CORE-6279: Put options in user management statements in any order
  Reference(s): /doc/sql.extensions/README.user_management
  Contributor(s): Alex Peshkoff

• CORE-6278: Efficient table scans for DBKEY-based range conditions
  Contributor(s): Dmitry Yemanov

• CORE-6274: Increase parse speed of long queries
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6268: Add methods to set various names (field, relation, etc.) in metadata builder
  Reference(s): /doc/Using_OO_API.html
  Contributor(s): Alex Peshkoff

• CORE-6239: Procedures and EXECUTE BLOCK without RETURNS should not be allowed to use SUSPEND
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6237: Performance problem when using SRP plugin
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6220: Enable delivery of known to the client key to any connection to the server
  Contributor(s): Alex Peshkoff

• CORE-6219: Add support for special (inf/nan) values when sorting DECFLOAT values
  Contributor(s): Alex Peshkoff

• CORE-6095: Extend trace record for COMMIT/ROLLBACK RETAINING to allow chaining of transaction ids
  Note(s): Backported into v3.0.6
  Contributor(s): Vlad Khorsun

• CORE-6069: Show OS-specific error when entrypont is not found in dynamic library
  Contributor(s): Alex Peshkoff

• CORE-6058: Change behavior of skipped and repeated wall times within time zones
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6049: Builtin functions converting binary string to hexadecimal representation and vice versa
  Reference(s): /doc/sql.extensions/README.builtin_functions.txt
  Contributor(s): Alex Peshkoff

• CORE-6048: Provide ability to see current state of DB encryption
  Reference(s): /doc/README.monitoring_tables
  Contributor(s): Alex Peshkoff

• CORE-6032: Add DPB properties for time zone bind and decfloat configuration
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6017: Add transaction info fb_info_tra_snapshot_number
  Contributor(s): Vlad Khorsun

• CORE-5658: Execute statement with excess parameters
  Reference(s): /doc/sql.extensions/README.execute_statement2
  Contributor(s): Vlad Khorsun

• CORE-5538: Add ability to backup/restore only those (several) tables which are enumerated as command line argument (pattern)
  Reference(s): /doc/README.gbak
  Contributor(s): Dimitry Sibiryakov

• CORE-4726: Implement REcreate user <user_name> password <user_pwd>
  Contributor(s): Alex Peshkoff

• CORE-4579: Distribute separate header files instead merged one
  Contributor(s): Dimitry Sibiryakov

• CORE-3983: Ability to authenticate user in "EXECUTE STATEMENT ON EXTERNAL DATA SOURCE" by hash of the current password
  Contributor(s): Alex Peshkoff

Bugfixes

• CORE-6290: Hex number used at the end of statement may read invalid memory and produce wrong values or exceptions
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6283: isNullable() in message metadata, returned by metadata builder, does not match with datatype set by setType() in metadata builder
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6282: Change type of MON$ATTACHMENTS.MON$IDLE_TIMER and MON$STATEMENTS.MON$STATEMENT_TIMER to TIMESTAMP WITH TIME ZONE
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6281: Invalid timestamp errors with RDB$TIME_ZONE_UTIL.TRANSITIONS
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6280: MERGE statement loses parameters in WHEN (NOT) MATCHED clause that will never be matched, crashes server in some situations
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6272: Failed attach to a database is not traced
  Contributor(s): Alex Peshkoff

• CORE-6266: Deleting records from MON$ATTACHMENTS using ORDER BY clause doesn't close the corresponding attachments
  Note(s): Backported into v3.0.6
  Contributor(s): Dmitry Yemanov

• CORE-6265: Mapping rules are destroyed by backup / restore
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6264: GBAK with PIPE to stdout: invalid content if user '-se :service_mgr' command switch
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6262: SHOW DOMAIN/TABLE does not display character set of system objects
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6260: Warnings are not always displayed in ISQL
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6254: Server crashes when using SET TRANSACTION and ON TRANSACTION START trigger uses EXECUTE STATEMENT against current transaction
  Note(s): Backported into v3.0.6
  Contributor(s): Vlad Khorsun

• CORE-6253: Crash caused by the locked fb_lock file
  Note(s): Backported into v3.0.6
  Contributor(s): Vlad Khorsun

• CORE-6252: UNIQUE CONSTRAINT violation
  Note(s): Backported into v3.0.6
  Contributor(s): Vlad Khorsun

• CORE-6251: Crash when built-in function LEFT or RIGHT is missing its 2nd argument
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6250: Signature mismatch when creating package body on identical packaged procedure header
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6248: A number of errors when database name is longer than 255 symbols
  Contributor(s): Alex Peshkoff

• CORE-6243: Regression: v4 Beta 1 rejects POSITION element of v2.5 defined SQL2003 CREATE TRIGGER syntax
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6241: Values greater than number of days between 01.01.0001 and 31.12.9999 (=3652058) can be added or subtracted from DATE
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6238: DECFLOAT: subtraction Num1 - Num2 leads to "Decimal float overflow" if Num2 is specified in scientific notation and less than max double (1.7976931348623157e308)
  Contributor(s): Alex Peshkoff

• CORE-6236: RDB$TIME_ZONE_UTIL package has wrong privilege for PUBLIC
  Contributor(s): Adriano dos Santos Fernandes, Dmitry Yemanov

• CORE-6233: Wrong dependencies of stored function on view after backup/restore
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6231: Server crashes on shutdown of XNET connection to a local database when events have been registered
  Note(s): Backported into v3.0.6
  Contributor(s): Vlad Khorsun

• CORE-6230: Unable to connect with database if security.db reference is removed from databases.conf file
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6227: isc_info_svc_user_dbpath always returns alias of main security database
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6224: Server crash: re-destruction of the rem_port object
  Note(s): Backported into v3.0.6
  Contributor(s): Dmitry Kovalenko, Alex Peshkoff

• CORE-6221: Incorrect (throw-based) allocFunc for zlib1: memory leak is possible
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6218: COUNT(DISTINCT <DECFLOAT_FIELD>) leads FB to crash when there are duplicate values of this field
  Contributor(s): Alex Peshkoff

• CORE-6217: [inet.cpp] Dangerous work with pointer: delete ptr; ptr=new ;
  Note(s): Backported into v3.0.6
  Contributor(s): Dmitry Kovalenko, Alex Peshkoff

• CORE-6214: Update outdated tzdata version
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6212: Authentication plugin on server may get garbage data from client instead empty packet
  Contributor(s): Alex Peshkoff

• CORE-6211: Command "ISQL -X" can not extract ROLE name when use multi-byte charset for connection
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6208: Grant lost in security.db after backup/restore cycle
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6207: Modifications needed to complile Firebird.pas under FPC
  Contributor(s): Alex Peshkoff

• CORE-6206: VARCHAR of insufficient length used for set bind of decfloat to varchar
  Contributor(s): Vlad Khorsun

• CORE-6205: Generate proper error for UNION DISTINCT with more than 255 columns
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6186: Original content of column which is involved into ENCRYPT() is displayed as distorted view after this call
  Contributor(s): Alex Peshkoff

• CORE-6181: Operations when using "SET DECFLOAT BIND BIGINT,n" with result of 11+ digits, fail with "Decimal float invalid operation"
  Contributor(s): Alex Peshkoff

• CORE-6174: ibase.h is missing from nightly builds
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6170: Cannot install on CentOS 8 because version of LibTomMath and LibNCurses library
  Contributor(s): Alex Peshkoff

• CORE-6166: Problems with long object names (> 255 bytes)
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6160: SUBSTRING of non-text/-blob is described to return NONE character set in DSQL
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6159: SUBSTRING SIMILAR is described with wrong data type in DSQL
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6130: Creating backup to stdout using service manager is broken
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-6116: Metadata script extracted using ISQL of a database restored from a v2.5.9 backup is invalid when table has COMPUTED BY fields
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6110: 64-bit transaction IDs are not stored properly in status vector
  Contributor(s): Ilya Eremin

• CORE-6080: Attempt to drop existing user randomly fails with "336723990 : record not found for user"
  Contributor(s): Vlad Khorsun

• CORE-6071: Restore of encrypted backup of database with SQL dialect 1 fails
  Contributor(s): Alex Peshkoff

• CORE-6061: Building with --with-builtin-tommath doesn't work
  Contributor(s): Alex Peshkoff

• CORE-6056: Overflow warnings when building some collations
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6046: Incorrect time zone parsing reads garbage in memory
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6044: ISQL issues with increased identifier length
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6034: The original time zone should be set to the current time zone at routine invocation
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6033: SUBSTRING(CURRENT_TIMESTAMP) does not work
  Contributor(s): Adriano dos Santos Fernandes

• CORE-6019: Wire compression does not work without MSVC 2010 runtime installation
  Contributor(s): Vlad Khorsun

• CORE-5976: GBAK multi-database file restore uses wrong minimum number of pages for first database file
  Contributor(s): Mark Rotteveel

• CORE-5972: External engine trigger crashing server if table have computed field
  Note(s): Backported into v3.0.6
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5957: Bug in SIMILAR TO when adding numeric quantifier as bound for repetetion of expression leads to empty resultset
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5931: SIMILAR TO does not return result when invalid pattern is used
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5892: SQL SECURITY DEFINER context is not properly evaluated for monitoring tables
  Contributor(s): Roman Simakov

• CORE-5697: Conversion from numeric literals to DECFLOAT adds precision that is not originally present
  Contributor(s): Alex Peshkoff

• CORE-5696: Conversion from zero numeric literals to DECFLOAT results in incorrect value
  Contributor(s): Alex Peshkoff

• CORE-5691: File description on Firebird executables should be specific
  Contributor(s): Vlad Khorsun

• CORE-5664: SIMILAR TO is substantially (500-700x) slower than LIKE on trivial pattern matches with VARCHAR data
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5445: Cannot install on Debian Stretch/Testing because version of LibTomMath library
  Contributor(s): Alex Peshkoff

• CORE-5364: gfix -online normal (executed in session #1) does not produce error when there is a SYSDBA-owned session #2
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

• CORE-4893: SIMILAR-TO leads FB to crash when matching blob with size > 2Gb to a string literal
  Contributor(s): Adriano dos Santos Fernandes

• CORE-4874: Infinite "SIMILAR TO" matching
  Contributor(s): Adriano dos Santos Fernandes

• CORE-4739: Accent insensitive comparison: diacritical letters with DIAGONAL crossing stroke pass only test on EQUALITY to their non-accented forms
  Contributor(s): Adriano dos Santos Fernandes

• CORE-3858: Very poor performance of SIMILAR TO on some arguments
  Contributor(s): Adriano dos Santos Fernandes

• CORE-3380: Disable reading from the newly created BLOB
  Contributor(s): Adriano dos Santos Fernandes

• CORE-2251: GBAK doesn't return error code
  Note(s): Backported into v3.0.6
  Contributor(s): Alex Peshkoff

v4.0 Beta 1 (20-Feb-2019)

New features

• CORE-5990: Pool of external connections
  Reference(s): /doc/sql.extensions/README.external_connections_pool
  Contributor(s): Vlad Khorsun

• CORE-5970: Built-in cryptographic functions
  Reference(s): /doc/sql.extensions/README.builtin_functions.txt
  Contributor(s): Alex Peshkoff

• CORE-5953: Statement level read consistency in read-committed transactions
  Reference(s): /doc/README.read_consistency.md
  Contributor(s): Nickolay Samofatov, Roman Simakov, Vlad Khorsun

• CORE-5951: Add support of batch insert and update operations
  Reference(s): /doc/Using_OO_API.html
  Contributor(s): Alex Peshkoff

• CORE-5808: Support backup of encrypted databases
  Contributor(s): Alex Peshkoff

• CORE-5768: Implement FILTER-clause for aggregate functions
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5620: Add builtin functions FIRST_DAY and LAST_DAY
  Reference(s): /doc/sql.extensions/README.builtin_functions.txt
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5536: Connection compressed/encrypted status in MON$ATTACHMENTS table
  Reference(s): /doc/README.monitoring_tables
  Contributor(s): Alex Peshkoff

• CORE-2022: Built-in logical replication
  Reference(s): /doc/README.replication.md
  Contributor(s): Dmitry Yemanov

• CORE-909: Ability to retrieve current UTC/GMT timestamp
  Reference(s): /doc/sql.extensions/README.time_zone.md
  Contributor(s): Adriano dos Santos Fernandes

• CORE-694: Support for time zones
  Reference(s): /doc/sql.extensions/README.time_zone.md
  Contributor(s): Adriano dos Santos Fernandes

Improvements

• CORE-5973: Handling FP overflow in DOUBLE PRECISION value when converting from DECFLOAT
  Contributor(s): Alex Peshkoff

• CORE-5954: Garbage collection in intermediate record versions
  Reference(s): /doc/README.read_consistency.md
  Contributor(s): Nickolay Samofatov, Roman Simakov, Vlad Khorsun

• CORE-5952: Enhance restore performance of GBAK using batch API
  Contributor(s): Alex Peshkoff

• CORE-5948: Make WIN_SSPI plugin produce keys for wirecrypt plugin
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5928: Make it possible for AuthClient plugin to access authentication block from DPB
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5921: Provide information about Global Commit Number, Commit Number of currently used database snapshot (if any) and Commit Numbers assigned to the committed transactions
  Reference(s): /doc/sql.extensions/README.builtin_functions.txt
  Contributor(s): Vlad Khorsun

• CORE-5887: Allow the use of management statements in PSQL blocks
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5883: Services version 1 cleanup
  Contributor(s): Alex Peshkoff

• CORE-5874: Provide name of read-only column incorrectly referenced in UPDATE ... SET xxx
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5779: Add support for riscv64
  Contributor(s): Richard Jones

• CORE-5770: User who is allowed to manage other users must have this ability WITHOUT need to grant him RDB$ADMIN role
  Contributor(s): Alex Peshkoff

• CORE-5741: Replace word "fixing" with "adjusting" in GBAK output
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5718: Make TempCacheLimit setting database-wise
  Contributor(s): Dmitry Yemanov

• CORE-5705: Store precision of DECFLOAT in RDB$FIELDS
  Contributor(s): Alex Peshkoff

• CORE-5647: Increase number of formats/versions of views from 255 to 32K
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5606: Add expression index name to exception message if computation failed
  Contributor(s): Adriano dos Santos Fernandes

• CORE-4529: Allow to use index when GROUP BY on field which has DESCENDING index
  Contributor(s): Dmitry Yemanov

• CORE-4409: Enhancement in precision of calculations with NUMERIC/DECIMAL
  Contributor(s): Alex Peshkoff

• CORE-3808: Provide ability to return all columns using RETURNING clause
  Reference(s): /doc/sql.extensions/README.returning
  Contributor(s): Adriano dos Santos Fernandes

Bugfixes

• CORE-5995: Creator user name is empty in user trace sessions
  Note(s): Backported into v3.0.5
  Contributor(s): Vlad Khorsun

• CORE-5993: When creation of audit log file fails, there is no error message in firebird.log
  Note(s): Backported into v3.0.5
  Contributor(s): Vlad Khorsun

• CORE-5991: Trace could not work correctly with quoted file names in trace configurations
  Note(s): Backported into v3.0.5
  Contributor(s): Vlad Khorsun

• CORE-5989: iconv / libiconv 1.15 vs libc / libiconv_open | common/isc_file.cpp
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5986: Incorrect evaluation of NULL IS [NOT] {FALSE | TRUE}
  Note(s): Backported into v3.0.5
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5985: Regression: ROLE does not passed in ES/EDS (specifying it in the statement is ignored)
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5982: Error "read permission for BLOB field", when it's an input/output procedure's parameter
  Note(s): Backported into v3.0.5
  Contributor(s): Dmitriy Starodubov

• CORE-5980: Firebird crashes due to concurrent operations with expression indices
  Note(s): Backported into v3.0.5
  Contributor(s): Vlad Khorsun

• CORE-5974: Wrong result of select distinct with decfload/timezone/collated column
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5972: External engine trigger crashing server if table have computed field
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5965: FB3 optimizer chooses less efficient plan than FB2.5 optimizer
  Note(s): Backported into v3.0.5
  Contributor(s): Dmitry Yemanov

• CORE-5959: Firebird returns wrong time after changes of time zone
  Note(s): Backported into v3.0.5
  Contributor(s): Vlad Khorsun

• CORE-5955: Unable to init binreloc with ld >= 2.31
  Note(s): Backported into v3.0.5
  Contributor(s): Roman Simakov

• CORE-5950: Deadlock when attaching to bugchecked database
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5943: Server crashes preparing a query with both DISTINCT/ORDER BY and non-field expression in the select list
  Note(s): Backported into v3.0.5
  Contributor(s): Dmitry Yemanov

• CORE-5934: gpre_boot fails to link using cmake, undefined reference 'dladdr' and 'dlerror'
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5930: Bugcheck "incorrect snapshot deallocation - too few slots"
  Contributor(s): Vlad Khorsun

• CORE-5927: With some non-standard authentication plugins providing correct crypt key wire anyway remains not encrypted
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5926: Attempt to create mapping with non-ASCII user name which is encoded in SINGLE-BYTE codepage (WIN1251) leads to 'Malformed string' error
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5918: Memory pool statistics is not accurate
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5907: Regression: can not launch trace if its 'database' section contains regexp pattern with curvy brackets to enclose quantifier
  Note(s): Backported into v3.0.5
  Contributor(s): Alex Peshkoff

• CORE-5896: NOT NULL constraint is not synchronized after rename column
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5871: Incorrect caching of the subquery result (procedure call) in independent queries
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5862: Varchar computed column without explicit type does not populate RDB$CHARACTER_LENGTH
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5861: GRANT OPTION is not checked for new object
  Contributor(s): Roman Simakov

• CORE-5855: Firebird 4.0 cannot backup DB with generators which contains space in the names
  Contributor(s): Alex Peshkoff

• CORE-5800: After backup/restore the indexes by expression on computed field are not working properly
  Note(s): Backported into v3.0.5
  Contributor(s): Dmitry Yemanov

• CORE-5795: ORDER BY clause on compound index may disable usage of other indices
  Note(s): Backported into v3.0.5
  Contributor(s): Dmitry Yemanov

• CORE-5750: Date-time parsing is very weak
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5728: Field subtype of DEC_FIXED columns not returned by isc_info_sql_sub_type
  Contributor(s): Alex Peshkoff

• CORE-5726: Unclear error message when inserting value exceeding max of DEC_FIXED decimal
  Contributor(s): Alex Peshkoff

• CORE-5717: Reject non-constant date/time/timestamp literals
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5710: Datatype declaration DECFLOAT without precision should use a default precision
  Contributor(s): Alex Peshkoff

• CORE-5700: DECFLOAT underflow should yield zero instead of an error
  Contributor(s): Alex Peshkoff

• CORE-5699: DECFLOAT should not throw exceptions when +/-NaN, +/-sNaN and +/-Infinity is used in comparisons
  Contributor(s): Alex Peshkoff

• CORE-5657: Various UDF-related security vulnerabilities
  Contributor(s): Alex Peshkoff

• CORE-5646: Parse error when compiling a statement causes memory leak until attachment is disconnected
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5639: Mapping rule using WIN_SSPI plugin: windows user group conversion to firebird role does not work
  Contributor(s): Alex Peshkoff

• CORE-5637: string right truncation on restore of security db
  Contributor(s): Alex Peshkoff

• CORE-5612: Gradual slowdown of view operations (create, recreate or drop)
  Contributor(s): Dmitry Yemanov

• CORE-5611: Higher memory consumption for prepared statements
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5593: System function RDB$ROLE_IN_USE cannot take long role names
  Contributor(s): Alex Peshkoff

• CORE-5518: Firebird UDF string2blob() may allow remote code execution
  Contributor(s): Alex Peshkoff

• CORE-5480: SUBSTRING startposition smaller than 1 should be allowed
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5395: Invalid data type for negation (minus operator)
  Note(s): Backported into v3.0.5
  Contributor(s): Adriano dos Santos Fernandes, Dmitry Yemanov

• CORE-5118: Indices on computed fields are broken after restore (all keys are NULL)
  Note(s): Backported into v3.0.5
  Contributor(s): Dmitry Yemanov

• CORE-5070: Compound index cannot be used for filtering in some ORDER/GROUP BY queries
  Note(s): Backported into v3.0.5
  Contributor(s): Dmitry Yemanov

• CORE-1592: Altering procedure parameters can lead to unrestorable database
  Contributor(s): Adriano dos Santos Fernandes

v4.0 Alpha 1 (23-Aug-2017)

New features

• CORE-5568: SQL SECURITY feature
  Reference(s): /doc/sql.extensions/README.sql_security.txt
  Contributor(s): Roman Simakov

• CORE-5525: Create high-precision floating point datatype named DECFLOAT
  Reference(s): /doc/sql.extensions/README.data_types
  Contributor(s): Alex Peshkoff

• CORE-5488: Timeouts for running SQL statements and idle connections
  Reference(s): /doc/README.session_idle_timeouts, /doc/README.statement_timeouts
  Contributor(s): Vlad Khorsun

• CORE-5463: Support DEFAULT context value in INSERT, UPDATE, MERGE and UPDATE OR INSERT statements
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5449: Support GENERATED ALWAYS identity columns and OVERRIDE clause
  Reference(s): doc/sql.extensions/README.identity_columns.txt
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5346: Named windows
  Reference(s): doc/sql.extensions/README.window_functions.md
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5343: Allow particular DBA privileges to be transferred to regular users
  Reference(s): doc/sql.extensions/README.builtin_functions.txt, doc/sql.extensions/README.ddl
  Contributor(s): Alex Peshkoff

• CORE-3647: Frames for window functions
  Reference(s): doc/sql.extensions/README.window_functions.md
  Contributor(s): Adriano dos Santos Fernandes

• CORE-2762: New built-in function to check whether some role is implicitly active
  Reference(s): doc/sql.extensions/README.cumulative_roles.txt
  Contributor(s): Roman Simakov

• CORE-1815: Ability to grant role to another role
  Reference(s): doc/sql.extensions/README.cumulative_roles.txt
  Contributor(s): Roman Simakov

• CORE-1688: More ANSI SQL:2003 window functions (PERCENK_RANK, CUME_DIST, NTILE)
  Reference(s): doc/sql.extensions/README.window_functions.md
  Contributor(s): Hajime Nakagami, Adriano dos Santos Fernandes

• CORE-751: Implicitly active roles (and their permissions summarized)
  Contributor(s): Roman Simakov

Improvements

• CORE-5431: Support for DROP IDENTITY clause
  Reference(s): doc/sql.extensions/README.identity_columns.txt
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5430: Support for INCREMENT option in identity columns
  Reference(s): doc/sql.extensions/README.identity_columns.txt
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5380: Allow subroutines to call others subroutines and themself recursively
  Reference(s): doc/sql.extensions/README.subroutines.txt
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5238: Replace xinetd support with the native listener Contributor(s): Alex Peshkoff

• CORE-5119: Support autocommit mode in SET TRANSACTION statement
  Contributor(s): Dmitry Yemanov

• CORE-5064: Add datatypes (VAR)BINARY(n) and BINARY VARYING(n) as aliases for (VAR)CHAR(n) CHARACTER SET OCTETS
  Contributor(s): Dimitry Sibiryakov

• CORE-4436: Support for different hash algorithms in HASH system function
  Reference(s): doc/sql.extensions/README.builtin_functions.txt
  Contributor(s): Adriano dos Santos Fernandes

• CORE-2557: Grants on MON$ tables
  Contributor(s): Alex Peshkoff

• CORE-2216: NBackup as online dump
  Contributor(s): Roman Simakov, Vlad Khorsun

• CORE-2192: Extend maximum database page size to 32KB
  Contributor(s): Dmitry Yemanov

• CORE-2040: Allow exception name and possibly exception text to be determined within a "WHEN ANY" error handling block
  Reference(s): doc/sql.extensions/README.context_variables
  Contributor(s): Dmitry Yemanov

• CORE-1132: Exception context in PSQL exception handlers
  Reference(s): doc/sql.extensions/README.context_variables
  Contributor(s): Dmitry Yemanov

• CORE-749: Increase maximum length of object names to 63 characters
  Contributor(s): Adriano dos Santos Fernandes

Bugfixes

• CORE-5545: Wrong syntax with CREATE TRIGGER ... ON used with POSITION
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5454: INSERT into updatable view without explicit field list failed
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5408: Result of boolean expression can not be concatenated with string literal
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5404: Inconsistent column/line references when PSQL definitions return errors
  Contributor(s): Adriano dos Santos Fernandes

• CORE-5237: Invalid handling of dot (.) and asterisk (*) in config file name and path for include clause
  Contributor(s): Dimitry Sibiryakov

• CORE-5223: Double dots are prohibited in file names if access is restricted to a list of directories
  Contributor(s): Dimitry Sibiryakov

• CORE-5141: Field definition allows several NOT NULL clauses
  Contributor(s): Dimitry Sibiryakov

• CORE-4985: Non-privileged user can implicitly count records in a restricted table
  Contributor(s): Dmitry Yemanov

• CORE-4701: Index and blob garbage collection don't take into accout data in undo log
  Contributor(s): Dimitry Sibiryakov

• CORE-4483: Changed data not visible in WHEN-section if exception occured inside SP that has been called from this code
  Contributor(s): Dimitry Sibiryakov

• CORE-4424: Rollback to wrong savepoint if several exception handlers on the same level are executed
  Contributor(s): Dimitry Sibiryakov