rubenada commented on code in PR #2848:
URL: https://github.com/apache/calcite/pull/2848#discussion_r942672540
##########
core/src/main/java/org/apache/calcite/rel/rules/SemiJoinRule.java:
##########
@@ -232,6 +234,87 @@ default JoinToSemiJoinRuleConfig
withOperandFor(Class<Join> joinClass,
}
}
+ /**
+ * SemiJoinRule that matches a Project on top of a Join with a RelNode
+ * which is unique for Join's right keys.
+ *
+ * @see CoreRules#JOIN_ON_UNIQUE_TO_SEMI_JOIN */
+ public static class JoinOnUniqueToSemiJoinRule extends SemiJoinRule {
+
+ /** Creates a JoinOnUniqueToSemiJoinRule. */
+ protected JoinOnUniqueToSemiJoinRule(JoinOnUniqueToSemiJoinRuleConfig
config) {
+ super(config);
+ }
+
+ @Override public boolean matches(RelOptRuleCall call) {
+ final Project project = call.rel(0);
+ final Join join = call.rel(1);
+ final RelNode left = call.rel(2);
+
+ final ImmutableBitSet bits =
+ RelOptUtil.InputFinder.bits(project.getProjects(), null);
+ final ImmutableBitSet rightBits =
+ ImmutableBitSet.range(left.getRowType().getFieldCount(),
+ join.getRowType().getFieldCount());
+ return !bits.intersects(rightBits);
+ }
+
+ @Override public void onMatch(RelOptRuleCall call) {
+ final Project project = call.rel(0);
+ final Join join = call.rel(1);
+ final RelNode left = call.rel(2);
+ final RelNode right = call.rel(3);
+
+ // Same with ProjectToSemiJoinRule
+ if (right instanceof Aggregate) {
Review Comment:
Should we rather add in the new rule's config a predicate to not match
Aggregates on the join RHS:
```
...
b2 ->
b2.operand(Join.class).predicate(SemiJoinRule::isJoinTypeSupported).inputs(
b3 -> b3.operand(RelNode.class).anyInputs(),
b4 -> b4.operand(RelNode.class).predicate(n -> !(n instanceof
Aggregate)).anyInputs()
)))
```
Rather than matching it with two rules (the old and the new) and creating
two times the same result?
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