diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2023-04-05 16:59:00 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2023-04-05 16:59:09 -0400 |
| commit | 16dc2703c5413534d4989e08253e8f4fcb0e2aab (patch) | |
| tree | c25f739d183d93510418b734ebd36fc3e2e9fde9 /src/include/nodes/execnodes.h | |
| parent | dad50f677c42de207168a3f08982ba23c9fc6720 (diff) | |
Support "Right Anti Join" plan shapes.
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
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index d97f5a8e7dc..b0def732ca6 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -2073,7 +2073,8 @@ typedef struct MergeJoinState * OuterTupleSlot is empty!) * hj_OuterTupleSlot tuple slot for outer tuples * hj_HashTupleSlot tuple slot for inner (hashed) tuples - * hj_NullOuterTupleSlot prepared null tuple for right/full outer joins + * hj_NullOuterTupleSlot prepared null tuple for right/right-anti/full + * outer joins * hj_NullInnerTupleSlot prepared null tuple for left/full outer joins * hj_FirstOuterTupleSlot first tuple retrieved from outer plan * hj_JoinState current state of ExecHashJoin state machine |