jinxing64 commented on a change in pull request #1300: [CALCITE-3174] IS NOT
DISTINCT FROM condition pushed from filter to join is not collapsed
URL: https://github.com/apache/calcite/pull/1300#discussion_r300820587
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File path: core/src/main/java/org/apache/calcite/rel/rules/FilterJoinRule.java
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@@ -275,6 +276,28 @@ protected void perform(RelOptRuleCall call, Filter filter,
call.transformTo(relBuilder.build());
}
+ /**
+ * Get conjunctions of filter's condition but with collapsed
+ * {@code IS NOT DISTINCT FROM} expressions if needed.
+ *
+ * @param filter filter containing condition
+ * @return condition conjunctions with collapsed {@code IS NOT DISTINCT FROM}
+ * expressions if any
+ * @see RelOptUtil#conjunctions(RexNode)
+ */
+ private List<RexNode> getConjunctions(Filter filter) {
Review comment:
For the Join condition, it seems like we should always remember for
`collapseExpandedIsNotDistinctFromExpr`. If new rule added, users should do
this expansion again, just like this PR and
https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/rules/ProjectJoinTransposeRule.java#L92
I mean that shall we extract such behavior as a shared `RexShuttle`, and
have an approach to make this expansion automatic ?
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