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Re-disallow Memoize for parameterized nested loops with join filters

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This was previously fixed in 9e215378d but got broken again as a result
of 2489d76c4.  It seems that commit causes ppi_clauses to contain
duplicate clauses and it's no longer safe to check the list_length of
that list to determine if there are join conditions other than what's
mentioned in ppi_clauses.

Here we adjust the check to count the distinct rinfo_serial mentioned in
ppi_clauses.  We expect that extra->restrictlist won't have duplicate
rinfo_serials.

Reported-by: Amadeo Gallardo
Author: Richard Guo
Discussion: https://postgr.es/m/CADFREbW-BLJd7-a5J%2B5wjVumeFG1ByXiSOFzMtkmY_SDWckTxw%40mail.gmail.com
Backpatch-through: 16, where 2489d76c4 was introduced.
This commit is contained in:
David Rowley 2024-01-22 22:45:02 +13:00
parent b199eb89c6
commit 2bcf0785cd
1 changed files with 1 additions and 1 deletions
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2
src/backend/optimizer/path/joinpath.c
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@ -635,7 +635,7 @@ get_memoize_path(PlannerInfo *root, RelOptInfo *innerrel,
*/
if (extra->inner_unique &&
(inner_path->param_info == NULL ||
list_length(inner_path->param_info->ppi_clauses) <
bms_num_members(inner_path->param_info->ppi_serials) <
list_length(extra->restrictlist)))
return NULL;