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Make RelationGetPartitionDispatchInfo expand depth-first.

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With this change, the order of leaf partitions as returned by
RelationGetPartitionDispatchInfo should now be the same as the
order used by expand_inherited_rtentry.  This will make it simpler
for future patches to match up the partition dispatch information
with the planner data structures.  The new code is also, in my
opinion anyway, simpler and easier to understand.

Amit Langote, reviewed by Amit Khandekar.  I also reviewed and
made a few cosmetic revisions.

Discussion: http://postgr.es/m/d98d4761-5071-1762-501e-0e15047c714b@lab.ntt.co.jp
This commit is contained in:
Robert Haas
2017-09-14 12:28:50 -04:00
parent 8951c65df2
commit 77b6b5e9ce
2 changed files with 123 additions and 150 deletions
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7
src/backend/optimizer/prep/prepunion.c
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@ -1565,6 +1565,13 @@ expand_inherited_rtentry(PlannerInfo *root, RangeTblEntry *rte, Index rti)
root->append_rel_list = list_concat(root->append_rel_list, appinfos);
}
/*
* expand_partitioned_rtentry
* Recursively expand an RTE for a partitioned table.
*
* Note that RelationGetPartitionDispatchInfo will expand partitions in the
* same order as this code.
*/
static void
expand_partitioned_rtentry(PlannerInfo *root, RangeTblEntry *parentrte,
Index parentRTindex, Relation parentrel,