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Make sequential scans parallel-aware.

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In addition, this path fills in a number of missing bits and pieces in
the parallel infrastructure.  Paths and plans now have a parallel_aware
flag indicating whether whatever parallel-aware logic they have should
be engaged.  It is believed that we will need this flag for a number of
path/plan types, not just sequential scans, which is why the flag is
generic rather than part of the SeqScan structures specifically.
Also, execParallel.c now gives parallel nodes a chance to initialize
their PlanState nodes from the DSM during parallel worker startup.

Amit Kapila, with a fair amount of adjustment by me.  Review of previous
patch versions by Haribabu Kommi and others.
This commit is contained in:
Robert Haas
2015-11-11 08:57:52 -05:00
parent f764ecd81b
commit f0661c4e8c
18 changed files with 254 additions and 73 deletions
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src/backend/optimizer/path/allpaths.c
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@ -475,7 +475,7 @@ set_plain_rel_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
required_outer = rel->lateral_relids;
/* Consider sequential scan */
add_path(rel, create_seqscan_path(root, rel, required_outer));
add_path(rel, create_seqscan_path(root, rel, required_outer, 0));
/* Consider index scans */
create_index_paths(root, rel);