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Commit3e2fe32

Etsuro Fujita

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Update comment about set_join_pathlist_hook().

The comment introduced by commite7cb7ee was a bit too terse, whichcould lead to extensions doing different things within the hook functionthan we intend to allow. Extend the comment to explain what they can dowithin the hook function.Back-patch to all supported branches.In passing, I rephrased a nearby comment that I recently added to theback branches.Reviewed by David Rowley and Andrei Lepikhov.Discussion:https://postgr.es/m/CAPmGK15SBPA1nr3Aqsdm%2BYyS-ay0Ayo2BRYQ8_A2To9eLqwopQ%40mail.gmail.com

1 parentf7dbdab commit3e2fe32Copy full SHA for 3e2fe32

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src/backend/optimizer/path
- joinpath.c

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`‎src/backend/optimizer/path/joinpath.c`

Lines changed: 6 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -326,7 +326,8 @@ add_paths_to_joinrel(PlannerInfo *root,`
`326`	`326`	`/*`
`327`	`327`	`* createplan.c does not currently support handling of pseudoconstant`
`328`	`328`	`* clauses assigned to joins pushed down by extensions; check if the`
`329`		`- * restrictlist has such clauses, and if so, disallow pushing down joins.`
	`329`	`+ * restrictlist has such clauses, and if not, allow them to consider`
	`330`	`+ * pushing down joins.`
`330`	`331`	`*/`
`331`	`332`	`if ((joinrel->fdwroutine&&`
`332`	`333`	`joinrel->fdwroutine->GetForeignJoinPaths)\|\|`
`@@ -347,7 +348,10 @@ add_paths_to_joinrel(PlannerInfo *root,`
`347`	`348`	`jointype,&extra);`
`348`	`349`
`349`	`350`	`/*`
`350`		`- * 6. Finally, give extensions a chance to manipulate the path list.`
	`351`	`+ * 6. Finally, give extensions a chance to manipulate the path list. They`
	`352`	`+ * could add new paths (such as CustomPaths) by calling add_path(), or`
	`353`	`+ * add_partial_path() if parallel aware. They could also delete or modify`
	`354`	`+ * paths added by the core code.`
`351`	`355`	`*/`
`352`	`356`	`if (set_join_pathlist_hook&&`
`353`	`357`	`consider_join_pushdown)`

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Commit3e2fe32

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`‎src/backend/optimizer/path/joinpath.c`

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