mirror of
https://github.com/FirebirdSQL/firebird.git
synced 2025-01-31 16:43:03 +01:00
11495a55fb
Fixed the layering for WITH LOCK and (partially) ANY/ALL predicates. Cleaned up the outdated code that never worked (mapping DISTINCT to an index, some VMS remainings). Wiped out a lot of the pre-ODS11 optimizer logic. Some minor adjustments there. Re-implemented the full outer join from scratch. This resolves CORE-2678 (full outer join cannot use available indices). Resolved CORE-2796: DB_KEY is always zero for external tables. Implemented the core part of the scrollable PSQL cursors. Implementation is still incomplete, but ready for testing. Some other changes I don't recall at the moment ;-) WARNING! The engine may be unstable. Please email me about any issues found.
140 lines
3.5 KiB
C++
140 lines
3.5 KiB
C++
/*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Dmitry Yemanov
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2009 Dmitry Yemanov <dimitr@firebirdsql.org>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#include "firebird.h"
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#include "../jrd/jrd.h"
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#include "../jrd/req.h"
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#include "../jrd/rse.h"
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#include "../jrd/cmp_proto.h"
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#include "../jrd/met_proto.h"
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#include "../jrd/vio_proto.h"
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#include "RecordSource.h"
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using namespace Firebird;
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using namespace Jrd;
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// -------------------------------
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// Data access: virtual table scan
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// -------------------------------
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VirtualTableScan::VirtualTableScan(CompilerScratch* csb, const string& name, UCHAR stream)
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: RecordStream(csb, stream), m_name(csb->csb_pool, name)
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{
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m_impure = CMP_impure(csb, sizeof(Impure));
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}
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void VirtualTableScan::open(thread_db* tdbb)
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{
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jrd_req* const request = tdbb->getRequest();
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Impure* const impure = (Impure*) ((UCHAR*) request + m_impure);
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impure->irsb_flags = irsb_open;
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record_param* const rpb = &request->req_rpb[m_stream];
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rpb->getWindow(tdbb).win_flags = 0;
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jrd_rel* const relation = rpb->rpb_relation;
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const Record* const record = rpb->rpb_record;
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const Format* format = NULL;
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if (!record || !record->rec_format)
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{
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format = MET_current(tdbb, relation);
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VIO_record(tdbb, rpb, format, request->req_pool);
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}
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else
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{
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format = record->rec_format;
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}
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rpb->rpb_number.setValue(BOF_NUMBER);
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DatabaseSnapshot* const snapshot = DatabaseSnapshot::create(tdbb);
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impure->irsb_record_buffer = snapshot->getData(relation);
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}
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void VirtualTableScan::close(thread_db* tdbb)
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{
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jrd_req* const request = tdbb->getRequest();
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invalidateRecords(request);
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Impure* const impure = (Impure*) ((UCHAR*) request + m_impure);
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if (impure->irsb_flags & irsb_open)
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{
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impure->irsb_flags &= ~irsb_open;
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impure->irsb_record_buffer = NULL;
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}
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}
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bool VirtualTableScan::getRecord(thread_db* tdbb)
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{
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jrd_req* const request = tdbb->getRequest();
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record_param* const rpb = &request->req_rpb[m_stream];
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Impure* const impure = (Impure*) ((UCHAR*) request + m_impure);
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if (!(impure->irsb_flags & irsb_open))
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{
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rpb->rpb_number.setValid(false);
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return false;
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}
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rpb->rpb_number.increment();
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fb_assert(impure->irsb_record_buffer);
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if (impure->irsb_record_buffer->fetch(rpb->rpb_number.getValue(), rpb->rpb_record))
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{
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rpb->rpb_number.setValid(true);
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return true;
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}
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rpb->rpb_number.setValid(false);
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return false;
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}
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bool VirtualTableScan::refetchRecord(thread_db* tdbb)
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{
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return true;
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}
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bool VirtualTableScan::lockRecord(thread_db* tdbb)
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{
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status_exception::raise(Arg::Gds(isc_record_lock_not_supp));
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return false; // compiler silencer
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}
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void VirtualTableScan::dump(thread_db* tdbb, UCharBuffer& buffer)
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{
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buffer.add(isc_info_rsb_begin);
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buffer.add(isc_info_rsb_relation);
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dumpName(tdbb, m_name, buffer);
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buffer.add(isc_info_rsb_type);
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buffer.add(isc_info_rsb_virt_sequential);
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buffer.add(isc_info_rsb_end);
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}
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