database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-30 11:03:19 +03:00
Code Activity

Make sequential scans parallel-aware.

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

2
src/backend/optimizer/plan/planner.c
View File

@ -4690,7 +4690,7 @@ plan_cluster_use_sort(Oid tableOid, Oid indexOid)
comparisonCost = 2.0 * (indexExprCost.startup + indexExprCost.per_tuple);
/* Estimate the cost of seq scan + sort */
seqScanPath = create_seqscan_path(root, rel, NULL);
seqScanPath = create_seqscan_path(root, rel, NULL, 0);
cost_sort(&seqScanAndSortPath, root, NIL,
seqScanPath->total_cost, rel->tuples, rel->width,
comparisonCost, maintenance_work_mem, -1.0);