xuzifu666 commented on code in PR #4488:
URL: https://github.com/apache/calcite/pull/4488#discussion_r2250002362
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core/src/main/java/org/apache/calcite/rex/RexSimplify.java:
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@@ -397,6 +403,22 @@ RexNode isFalse(RexNode e) {
: rexBuilder.makeCall(SqlStdOperatorTable.IS_FALSE, e);
}
+ /**
+ * Runs simplification unary function by eliminating idempotent.
+ */
+ private RexCall simplifUnaryFunction(RexCall rexCall) {
Review Comment:
Yes，currently this goal can be achieved based on this PR. For example,
lower(lower(upper(uper('a')))) will be simplified to lower(upper('a')).
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