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Fix possible crash in partition-wise join.

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The previous code assumed that we'd always succeed in creating
child-joins for a joinrel for which partition-wise join was considered,
but that's not guaranteed, at least in the case where dummy rels
are involved.

Ashutosh Bapat, with some wordsmithing by me.

Discussion: http://postgr.es/m/CAFjFpRf8=uyMYYfeTBjWDMs1tR5t--FgOe2vKZPULxxdYQ4RNw@mail.gmail.com
This commit is contained in:
Robert Haas
2018-02-05 17:31:57 -05:00
parent 1eb5d43bee
commit f069c91a57
6 changed files with 43 additions and 55 deletions
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5
src/backend/optimizer/util/relnode.c
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@ -1662,11 +1662,14 @@ build_joinrel_partition_info(RelOptInfo *joinrel, RelOptInfo *outer_rel,
*/
joinrel->part_scheme = part_scheme;
joinrel->boundinfo = outer_rel->boundinfo;
joinrel->nparts = outer_rel->nparts;
partnatts = joinrel->part_scheme->partnatts;
joinrel->partexprs = (List **) palloc0(sizeof(List *) * partnatts);
joinrel->nullable_partexprs =
(List **) palloc0(sizeof(List *) * partnatts);
joinrel->nparts = outer_rel->nparts;
joinrel->part_rels =
(RelOptInfo **) palloc0(sizeof(RelOptInfo *) * joinrel->nparts);
/*
* Construct partition keys for the join.