xiedeyantu commented on code in PR #4488:
URL: https://github.com/apache/calcite/pull/4488#discussion_r2250000705
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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:
Apologies, my example was too specific. What I meant is that there are two
idempotent functions, f and g, which may have multiple repetitions and can be
combined arbitrarily, but will ultimately simplify to either f(g(x)) or
g(f(x)). Of course, special cases like the one I mentioned above are exceptions.
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