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Eliminate "parallel degree" terminology.

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This terminology provoked widespread complaints.  So, instead, rename
the GUC max_parallel_degree to max_parallel_workers_per_gather
(leaving room for a possible future GUC max_parallel_workers that acts
as a system-wide limit), and rename the parallel_degree reloption to
parallel_workers.  Rename structure members to match.

These changes create a dump/restore hazard for users of PostgreSQL
9.6beta1 who have set the reloption (or applied the GUC using ALTER
USER or ALTER DATABASE).
This commit is contained in:
Robert Haas
2016-06-09 09:08:27 -04:00
parent 6581e930a8
commit c9ce4a1c61
19 changed files with 99 additions and 99 deletions
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6
src/backend/optimizer/plan/planner.c
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@ -245,7 +245,7 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
glob->parallelModeOK = (cursorOptions & CURSOR_OPT_PARALLEL_OK) != 0 &&
IsUnderPostmaster && dynamic_shared_memory_type != DSM_IMPL_NONE &&
parse->commandType == CMD_SELECT && !parse->hasModifyingCTE &&
parse->utilityStmt == NULL && max_parallel_degree > 0 &&
parse->utilityStmt == NULL && max_parallel_workers_per_gather > 0 &&
!IsParallelWorker() && !IsolationIsSerializable() &&
!has_parallel_hazard((Node *) parse, true);
@ -3622,7 +3622,7 @@ create_grouping_paths(PlannerInfo *root,
if (grouped_rel->partial_pathlist)
{
Path *path = (Path *) linitial(grouped_rel->partial_pathlist);
double total_groups = path->rows * path->parallel_degree;
double total_groups = path->rows * path->parallel_workers;
path = (Path *) create_gather_path(root,
grouped_rel,
@ -3717,7 +3717,7 @@ create_grouping_paths(PlannerInfo *root,
if (hashaggtablesize < work_mem * 1024L)
{
double total_groups = path->rows * path->parallel_degree;
double total_groups = path->rows * path->parallel_workers;
path = (Path *) create_gather_path(root,
grouped_rel,