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Commita6b2a51

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Avoid dangling-pointer problem with partitionwise joins under GEQO.
build_child_join_sjinfo creates a derived SpecialJoinInfo inthe short-lived GEQO context, but afterwards the semi_rhs_exprsfrom that may be used in a UniquePath for a child base relation.This breaks the expectation that all base-relation-level structuresare in the planning-lifespan context, leading to use of a danglingpointer with probable ensuing crash later on in create_unique_plan.To fix, copy the expression trees when making a UniquePath.Per bug #18360 from Alexander Lakhin. This has been broken sincepartitionwise joins were added, so back-patch to all supportedbranches.Discussion:https://postgr.es/m/18360-a23caf3157f34e62@postgresql.org
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‎src/backend/optimizer/util/pathnode.c

Lines changed: 7 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1707,8 +1707,13 @@ create_unique_path(PlannerInfo *root, RelOptInfo *rel, Path *subpath,
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pathnode->path.pathkeys=NIL;
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pathnode->subpath=subpath;
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pathnode->in_operators=sjinfo->semi_operators;
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pathnode->uniq_exprs=sjinfo->semi_rhs_exprs;
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/*
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* Under GEQO, the sjinfo might be short-lived, so we'd better make copies
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* of data structures we extract from it.
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*/
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pathnode->in_operators=copyObject(sjinfo->semi_operators);
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pathnode->uniq_exprs=copyObject(sjinfo->semi_rhs_exprs);
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/*
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* If the input is a relation and it has a unique index that proves the

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