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Add optimizer and executor support for parallel index-only scans.

Browse Source 
Commit 5262f7a4fc added similar support
for parallel index scans; this extends that work to index-only scans.
As with parallel index scans, this requires support from the index AM,
so currently parallel index-only scans will only be possible for btree
indexes.

Rafia Sabih, reviewed and tested by Rahila Syed, Tushar Ahuja,
and Amit Kapila

Discussion: http://postgr.es/m/CAOGQiiPEAs4C=TBp0XShxBvnWXuzGL2u++Hm1=qnCpd6_Mf8Fw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-02-19 15:53:59 +05:30
parent 16be2fd100
commit 0414b26bac
7 changed files with 191 additions and 26 deletions
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6
src/backend/optimizer/path/indxpath.c
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@ -1048,9 +1048,9 @@ build_index_paths(PlannerInfo *root, RelOptInfo *rel,
/*
* If appropriate, consider parallel index scan. We don't allow
* parallel index scan for bitmap or index only scans.
* parallel index scan for bitmap index scans.
*/
if (index->amcanparallel && !index_only_scan &&
if (index->amcanparallel &&
rel->consider_parallel && outer_relids == NULL &&
scantype != ST_BITMAPSCAN)
{
@ -1104,7 +1104,7 @@ build_index_paths(PlannerInfo *root, RelOptInfo *rel,
result = lappend(result, ipath);
/* If appropriate, consider parallel index scan */
if (index->amcanparallel && !index_only_scan &&
if (index->amcanparallel &&
rel->consider_parallel && outer_relids == NULL &&
scantype != ST_BITMAPSCAN)
{