From c8434d64ce03c32e0029417a82ae937f2055268f Mon Sep 17 00:00:00 2001 From: Etsuro Fujita Date: Wed, 8 Apr 2020 10:25:00 +0900 Subject: Allow partitionwise joins in more cases. Previously, the partitionwise join technique only allowed partitionwise join when input partitioned tables had exactly the same partition bounds. This commit extends the technique to some cases when the tables have different partition bounds, by using an advanced partition-matching algorithm introduced by this commit. For both the input partitioned tables, the algorithm checks whether every partition of one input partitioned table only matches one partition of the other input partitioned table at most, and vice versa. In such a case the join between the tables can be broken down into joins between the matching partitions, so the algorithm produces the pairs of the matching partitions, plus the partition bounds for the join relation, to allow partitionwise join for computing the join. Currently, the algorithm works for list-partitioned and range-partitioned tables, but not hash-partitioned tables. See comments in partition_bounds_merge(). Ashutosh Bapat and Etsuro Fujita, most of regression tests by Rajkumar Raghuwanshi, some of the tests by Mark Dilger and Amul Sul, reviewed by Dmitry Dolgov and Amul Sul, with additional review at various points by Ashutosh Bapat, Mark Dilger, Robert Haas, Antonin Houska, Amit Langote, Justin Pryzby, and Tomas Vondra Discussion: https://postgr.es/m/CAFjFpRdjQvaUEV5DJX3TW6pU5eq54NCkadtxHX2JiJG_GvbrCA@mail.gmail.com --- src/backend/optimizer/util/inherit.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'src/backend/optimizer/util/inherit.c') diff --git a/src/backend/optimizer/util/inherit.c b/src/backend/optimizer/util/inherit.c index 7db67fdf344..3132fd35a51 100644 --- a/src/backend/optimizer/util/inherit.c +++ b/src/backend/optimizer/util/inherit.c @@ -376,6 +376,8 @@ expand_partitioned_rtentry(PlannerInfo *root, RelOptInfo *relinfo, /* Create the otherrel RelOptInfo too. */ childrelinfo = build_simple_rel(root, childRTindex, relinfo); relinfo->part_rels[i] = childrelinfo; + relinfo->all_partrels = bms_add_members(relinfo->all_partrels, + childrelinfo->relids); /* If this child is itself partitioned, recurse */ if (childrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE) -- cgit v1.2.3