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Fix SEGV on query with Left Outer Join (#7787) #7789

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Fix SEGV on query with Left Outer Join (#7787) #7789

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10 changes: 10 additions & 0 deletions src/backend/distributed/planner/query_pushdown_planning.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2049,6 +2049,16 @@ CreateSubqueryTargetListAndAdjustVars(List *columnList)
*/
column->varno = 1;
column->varattno = resNo;

/*
* 1 subquery means there is one range table entry so with Postgres 16+ we need
* to ensure that column's varnullingrels - the set of join rels that can null
* the var - is empty. Otherwise, when given the query, the Postgres planner
* may attempt to access a non-existent range table and segfault, as in #7787.
*/
#if PG_VERSION_NUM >= PG_VERSION_16
column->varnullingrels = NULL;
#endif
}

return subqueryTargetEntryList;
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