1. Never allocate empty statement - always use att->prepare() to create statement interface
2. Separated IStatement into 2 parts - statement itself and resultset.
3. Added stmt->openCursor() (and att->openCursor() for unprepared statements) to create IResultSet.
4. Always use IMessageMetadata (former IParametersMetadata) to pass message fromat info from client,
therefore avoiding need in BLR generation in client applications.
2. Avoid massive segfaults when closing heavily loaded server.
3. Restored logic in YValve required for correct shutdown.
4. Do not change externally visible request body when preparing it.
Ability to stop execution of external query when :
- engine is shutted down
- database is shutted down
- local statement is cancelled
- local connection is cancelled
Allow to specify EXECUTE STATEMENToptional clauses in any (not fixed) order.
Use INTERNAL_PROVIDER for access to the current database by another user too.
