diff options
Diffstat (limited to 'src/backend/optimizer/path/indxpath.c')
| -rw-r--r-- | src/backend/optimizer/path/indxpath.c | 67 |
1 files changed, 64 insertions, 3 deletions
diff --git a/src/backend/optimizer/path/indxpath.c b/src/backend/optimizer/path/indxpath.c index 52834689881..56eccafd7b0 100644 --- a/src/backend/optimizer/path/indxpath.c +++ b/src/backend/optimizer/path/indxpath.c @@ -813,7 +813,7 @@ get_index_paths(PlannerInfo *root, RelOptInfo *rel, /* * build_index_paths * Given an index and a set of index clauses for it, construct zero - * or more IndexPaths. + * or more IndexPaths. It also constructs zero or more partial IndexPaths. * * We return a list of paths because (1) this routine checks some cases * that should cause us to not generate any IndexPath, and (2) in some @@ -1042,8 +1042,41 @@ build_index_paths(PlannerInfo *root, RelOptInfo *rel, NoMovementScanDirection, index_only_scan, outer_relids, - loop_count); + loop_count, + false); result = lappend(result, ipath); + + /* + * If appropriate, consider parallel index scan. We don't allow + * parallel index scan for bitmap or index only scans. + */ + if (index->amcanparallel && !index_only_scan && + rel->consider_parallel && outer_relids == NULL && + scantype != ST_BITMAPSCAN) + { + ipath = create_index_path(root, index, + index_clauses, + clause_columns, + orderbyclauses, + orderbyclausecols, + useful_pathkeys, + index_is_ordered ? + ForwardScanDirection : + NoMovementScanDirection, + index_only_scan, + outer_relids, + loop_count, + true); + + /* + * if, after costing the path, we find that it's not worth + * using parallel workers, just free it. + */ + if (ipath->path.parallel_workers > 0) + add_partial_path(rel, (Path *) ipath); + else + pfree(ipath); + } } /* @@ -1066,8 +1099,36 @@ build_index_paths(PlannerInfo *root, RelOptInfo *rel, BackwardScanDirection, index_only_scan, outer_relids, - loop_count); + loop_count, + false); result = lappend(result, ipath); + + /* If appropriate, consider parallel index scan */ + if (index->amcanparallel && !index_only_scan && + rel->consider_parallel && outer_relids == NULL && + scantype != ST_BITMAPSCAN) + { + ipath = create_index_path(root, index, + index_clauses, + clause_columns, + NIL, + NIL, + useful_pathkeys, + BackwardScanDirection, + index_only_scan, + outer_relids, + loop_count, + true); + + /* + * if, after costing the path, we find that it's not worth + * using parallel workers, just free it. + */ + if (ipath->path.parallel_workers > 0) + add_partial_path(rel, (Path *) ipath); + else + pfree(ipath); + } } } |