vlsi commented on a change in pull request #1818: [CALCITE-3809] RexSimplify
simplifies nondeterministic function incorrectly
URL: https://github.com/apache/calcite/pull/1818#discussion_r382071527
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File path: core/src/main/java/org/apache/calcite/rex/RexSimplify.java
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@@ -323,7 +323,7 @@ private RexNode simplifyComparison(RexCall e, RexUnknownAs
unknownAs) {
// Simplify "x <op> x"
final RexNode o0 = operands.get(0);
final RexNode o1 = operands.get(1);
- if (o0.equals(o1)) {
+ if (o0.equals(o1) && RexUtil.isDeterministic(o0)) {
Review comment:
Is `deep` check required here? Doesn't it produce O(N^2) behaviors?
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