zabetak commented on a change in pull request #1112: [CALCITE-2930]
FilterCorrelateRule on a Correlate with SemiJoinType SEMI (or ANTI) throws
IllegalStateException (Ruben Quesada Lopez)
URL: https://github.com/apache/calcite/pull/1112#discussion_r267218860
##########
File path:
core/src/main/java/org/apache/calcite/rel/rules/FilterCorrelateRule.java
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@@ -86,8 +86,10 @@ public void onMatch(RelOptRuleCall call) {
aboveFilters,
JoinRelType.INNER,
false,
- !corr.getJoinType().toJoinType().generatesNullsOnLeft(),
- !corr.getJoinType().toJoinType().generatesNullsOnRight(),
+ corr.getJoinType().returnsJustFirstInput()
+ || !corr.getJoinType().toJoinType().generatesNullsOnLeft(),
+ !corr.getJoinType().returnsJustFirstInput()
Review comment:
Can't this be replaced with `corr.getJoinType()==SemiJoinType.INNER`. The
only time where we can push the filter into the right relation is for
SemiJoinType.INNER. In any other the case the right side either generates nulls
either does not exist.
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