chunweilei commented on a change in pull request #1818: [CALCITE-3809]
RexSimplify simplifies nondeterministic function incorrectly
URL: https://github.com/apache/calcite/pull/1818#discussion_r382082782
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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:
IMO, yes, it is necessary here. It cannot be simplified if there is
nondeterministic call, i.e. abs(abs(abs(rand())))=abs(abs(abs(rand()))).
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