database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-04 20:11:56 +03:00
Code Activity

Support "Right Anti Join" plan shapes.

Browse Source 
Merge and hash joins can support antijoin with the non-nullable input
on the right, using very simple combinations of their existing logic
for right join and anti join.  This gives the planner more freedom
about how to order the join.  It's particularly useful for hash join,
since we may now have the option to hash the smaller table instead
of the larger.

Richard Guo, reviewed by Ronan Dunklau and myself

Discussion: https://postgr.es/m/CAMbWs48xh9hMzXzSy3VaPzGAz+fkxXXTUbCLohX1_L8THFRm2Q@mail.gmail.com
This commit is contained in:
Tom Lane
2023-04-05 16:59:00 -04:00
parent dad50f677c
commit 16dc2703c5
12 changed files with 244 additions and 194 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/include/nodes/nodes.h
View File

@@ -317,6 +317,7 @@ typedef enum JoinType
*/
JOIN_SEMI, /* 1 copy of each LHS row that has match(es) */
JOIN_ANTI, /* 1 copy of each LHS row that has no match */
JOIN_RIGHT_ANTI, /* 1 copy of each RHS row that has no match */
/*
* These codes are used internally in the planner, but are not supported
@@ -349,7 +350,8 @@ typedef enum JoinType
((1 << JOIN_LEFT) | \
(1 << JOIN_FULL) | \
(1 << JOIN_RIGHT) | \
(1 << JOIN_ANTI))) != 0)
(1 << JOIN_ANTI) | \
(1 << JOIN_RIGHT_ANTI))) != 0)
/*
* AggStrategy -