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Use bms_add_members() instead of bms_union() when possible

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bms_union() causes a new set to be allocated.  What this caller needs is
members added to an existing set.  bms_add_members() is the tool for
that job.

This is just a matter of fixing an inefficiency due to surplus memory
allocations.  No bugs being fixed.

The only other place I found that might be valid to apply this change is
in markNullableIfNeeded(), but I opted not to do that due to the risk to
reward ratio not looking favorable.  The risk being that there *could* be
another pointer pointing to the Bitmapset.

Author: David Rowley <dgrowleyml@gmail.com>
Reviewed-by: Greg Burd <greg@burd.me>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAApHDvoCcoS-p5tZNJLTxFOKTYNjqVh7Dwf+5ikDUBwnvWftRw@mail.gmail.com
This commit is contained in:
David Rowley
2025-10-04 12:19:31 +13:00
parent f8f4afe751
commit 5092aae431
1 changed files with 1 additions and 1 deletions
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2
src/backend/optimizer/prep/prepunion.c
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@@ -802,7 +802,7 @@ generate_union_paths(SetOperationStmt *op, PlannerInfo *root,
linitial(rel->partial_pathlist)); linitial(rel->partial_pathlist));
} }
relids = bms_union(relids, rel->relids); relids = bms_add_members(relids, rel->relids);
} }
/* Build result relation. */ /* Build result relation. */