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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 |