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Add SupportRequestInlineInFrom planner support request.

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This request allows a support function to replace a function call
appearing in FROM (typically a set-returning function) with an
equivalent SELECT subquery.  The subquery will then be subject
to the planner's usual optimizations, potentially allowing a much
better plan to be generated.  While the planner has long done this
automatically for simple SQL-language functions, it's now possible
for extensions to do it for functions outside that group.
Notably, this could be useful for functions that are presently
implemented in PL/pgSQL and work by generating and then EXECUTE'ing
a SQL query.

Author: Paul A Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/09de6afa-c33d-4d94-a5cb-afc6cea0d2bb@illuminatedcomputing.com
This commit is contained in:
Tom Lane
2025-11-22 19:33:34 -05:00
parent c0bc9af151
commit b140c8d7a3
9 changed files with 511 additions and 171 deletions
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4
src/include/optimizer/clauses.h
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@ -50,8 +50,8 @@ extern int NumRelids(PlannerInfo *root, Node *clause);
extern void CommuteOpExpr(OpExpr *clause);
extern Query *inline_set_returning_function(PlannerInfo *root,
RangeTblEntry *rte);
extern Query *inline_function_in_from(PlannerInfo *root,
RangeTblEntry *rte);
extern Bitmapset *pull_paramids(Expr *expr);