Unnest IN/ANY/EXISTS subqueries and optimize them using semi-join algorithm#8061
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Unnest IN/ANY/EXISTS subqueries and optimize them using semi-join algorithm#8061
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…eimplemented support for semi/anti joins inside the nested loop algorithm. Slightly changed implementation of full outer joins. Added transformation of IN/EXISTS subqueries into lateral semi-joins. Basic optimizer support for semi-joins. More efficient optimization for cross joins. Added some debug info (hash table statistics) for hash joins.
…, this allows expression-based hashing
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A partial implementation (covering only equivalence conditions) is committed into v5.0.1, but disabled by default (see |
… Procedures with subroutines.
Co-authored-by: Artyom Abakumov <[email protected]>
…e from backup (FB5, RC2) Don't use common SortOwner for sorts with different dbb's. After #7671 it could contain cached sort buffers from different pools (dbb_permanent) and then release it to the wrong dbb_sort_buffers making possible usage of deallocated memory later.
…(this time about short unpacked fragments)
* Add missing synchronization to cached vectors of known pages. Thanks to Vlad Khorsun. * Fixed typo
… ‘{0,N}’ doesn't work as expected.
Thanks to Pavel Zotov.
* Delete tra_dbcreators_list in ~jrd_tra If we don't delete it manually assert will be thrown if SEC$DB_CREATORS returns a lot of records * Add missing default initialization for tra_dbcreators_list --------- Co-authored-by: Artyom Ivanov <[email protected]>
Fixed bug #8203 : Function MAKE_DBKEY may produce random errors if used with relation name
…imitive estimation for hash vs loop semi-joins
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More complete implementation (enabled by default and so far without an option to disable it) is ready for v6. It adds a (limited but still) choice between nested loop and hash semi-join algorithms to be used. Optimization aspects are to be further improved in the master branch later. |
mrotteveel
added
the
rlsnotes60: no
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The initial implementation was developed by customer request, later it was slightly improved and committed into a separate branch for testing. Some issues were found that prevented it from inclusion into v5.0. Still work in progress.