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| author | Robert Haas <rhaas@postgresql.org> | 2015-10-22 10:37:24 -0400 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2015-10-22 10:37:24 -0400 |
| commit | 1a219fa15bf802d69621e71c43d1a09515bcdc50 (patch) | |
| tree | d1f58ffbd60c362e52c79ac189cc0101289c9400 /src/backend/executor/execParallel.c | |
| parent | e4a618aa1ec420f40198e89ef1afd7a4e8cfcecf (diff) | |
| download | postgresql-1a219fa15bf802d69621e71c43d1a09515bcdc50.tar.gz postgresql-1a219fa15bf802d69621e71c43d1a09515bcdc50.zip | |
Add header comments to execParallel.c and nodeGather.c.
Patch by me, per a note from Simon Riggs. Reviewed by Amit Kapila
and Amit Langote.
Diffstat (limited to 'src/backend/executor/execParallel.c')
| -rw-r--r-- | src/backend/executor/execParallel.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/executor/execParallel.c b/src/backend/executor/execParallel.c index 3bb820692d2..efcbaef416c 100644 --- a/src/backend/executor/execParallel.c +++ b/src/backend/executor/execParallel.c @@ -6,6 +6,14 @@ * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * + * This file contains routines that are intended to support setting up, + * using, and tearing down a ParallelContext from within the PostgreSQL + * executor. The ParallelContext machinery will handle starting the + * workers and ensuring that their state generally matches that of the + * leader; see src/backend/access/transam/README.parallel for details. + * However, we must save and restore relevant executor state, such as + * any ParamListInfo associated with the query, buffer usage info, and + * the actual plan to be passed down to the worker. * * IDENTIFICATION * src/backend/executor/execParallel.c |