danny0405 commented on a change in pull request #1322: [CALCITE-3198]
ReduceExpressionsRule.FILTER_INSTANCE does not reduce 'NOT(x=a AND x=b)'
URL: https://github.com/apache/calcite/pull/1322#discussion_r305571886
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File path: core/src/main/java/org/apache/calcite/rex/RexSimplify.java
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@@ -1605,6 +1605,8 @@ private void ensureParanoidOff() {
/** Simplifies a list of terms and combines them into an OR.
* Modifies the list in place. */
private RexNode simplifyOrs(List<RexNode> terms, RexUnknownAs unknownAs) {
+ // Auxiliary map to simplify cases like: X <> A OR X <> B => TRUE
+ final Map<RexNode, Comparison> notEqualsComparisonMap = new HashMap<>();
for (int i = 0; i < terms.size(); i++) {
Review comment:
Shouldn't we invoke the `#simplifyComparison` firstly for the `OR` operator
operands ? And BTW, this hashMap cache would trigger the digest computation of
`RexNode`, could we have another way to identify the equivalence for RexNode ?
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