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Support "Right Anti Join" plan shapes.

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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
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3
src/include/nodes/execnodes.h
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@@ -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

4
src/include/nodes/nodes.h
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@@ -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 -

5
src/include/nodes/pathnodes.h
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@@ -2766,8 +2766,9 @@ typedef struct PlaceHolderVar
* min_lefthand and min_righthand for higher joins.)
*
* jointype is never JOIN_RIGHT; a RIGHT JOIN is handled by switching
* the inputs to make it a LEFT JOIN. So the allowed values of jointype
* in a join_info_list member are only LEFT, FULL, SEMI, or ANTI.
* the inputs to make it a LEFT JOIN. It's never JOIN_RIGHT_ANTI either.
* So the allowed values of jointype in a join_info_list member are only
* LEFT, FULL, SEMI, or ANTI.
*
* ojrelid is the RT index of the join RTE representing this outer join,
* if there is one. It is zero when jointype is INNER or SEMI, and can be