Re: pgsql-server/ oc/src/sgml/release.sgml rc/back ...

I have marked IN/NOT IN performance problem as fixed in 7.4! Great job.

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Tom Lane wrote:
> CVSROOT: /cvsroot
> Module name: pgsql-server
> Changes by: tgl(at)postgresql(dot)org 03/01/20 13:55:08
>
> Modified files:
> doc/src/sgml : release.sgml
> src/backend/executor: nodeHashjoin.c nodeMergejoin.c
> nodeNestloop.c
> src/backend/nodes: copyfuncs.c equalfuncs.c list.c outfuncs.c
> src/backend/optimizer: README
> src/backend/optimizer/geqo: geqo_eval.c geqo_main.c
> src/backend/optimizer/path: allpaths.c costsize.c indxpath.c
> joinpath.c joinrels.c
> src/backend/optimizer/plan: createplan.c initsplan.c planmain.c
> planner.c setrefs.c subselect.c
> src/backend/optimizer/prep: Makefile prepunion.c
> src/backend/optimizer/util: clauses.c joininfo.c pathnode.c
> relnode.c tlist.c var.c
> src/backend/rewrite: rewriteManip.c
> src/backend/utils/adt: selfuncs.c
> src/include/nodes: nodes.h parsenodes.h pg_list.h relation.h
> src/include/optimizer: joininfo.h pathnode.h planmain.h
> planner.h prep.h subselect.h tlist.h
> var.h
> src/include/utils: selfuncs.h
> src/test/regress/expected: subselect.out
> Added files:
> src/backend/optimizer/prep: prepjointree.c
>
> Log message:
> IN clauses appearing at top level of WHERE can now be handled as joins.
> There are two implementation techniques: the executor understands a new
> JOIN_IN jointype, which emits at most one matching row per left-hand row,
> or the result of the IN's sub-select can be fed through a DISTINCT filter
> and then joined as an ordinary relation.
> Along the way, some minor code cleanup in the optimizer; notably, break
> out most of the jointree-rearrangement preprocessing in planner.c and
> put it in a new file prep/prepjointree.c.
>
>
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