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Cleaned up the outdated code that never worked (mapping DISTINCT to an index, some VMS remainings).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.
Stop using indexes when total cost is greater as the previous used total cost.
Fix excludeLower/exludeUpper problem with using more operators to the same field.
2) Better optimizaton for tables with zero selectivities.
3) Fixed wrong choice of index in the case of the same selectivity and number of indices.
4) Fixed wrong total selectivity calculated for compound non-equality comparisons.
5) Some constants tuning based on two weeks of the extreme testing.
Subject of Arno's review, although all my tests show much better results without any regressions.
ODS11:
- segment-selectivity
- better support for IS NULL
- better support for STARTING WITH
- matching both OR and AND nodes to indexes
- pick better JOIN order based on cost rules
ODSx:
- Indexed order on OUTER JOIN queries
