asolimando commented on a change in pull request #2839:
URL: https://github.com/apache/hive/pull/2839#discussion_r761765160
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File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveFilterProjectTransposeRule.java
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@@ -339,6 +339,11 @@ private void check(Filter filter) {
final RexNode filterCondition = simplify.simplify(filter.getCondition());
final Set<Integer> inputRefs =
HiveCalciteUtil.getInputRefs(newCondition);
+ // if the new IS NOT NULL has no input ref, there is redundancy here,
bail out
+ if (inputRefs.isEmpty()) {
Review comment:
I am tackling the use of `RexSimplify` in this rule in this other PR:
https://github.com/apache/hive/pull/2840
The majority of the test diff are (expected) changes in the plan, but there
are also few real failures I need to investigate, but you can check if what is
done there matches what you have in mind.
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