xiedeyantu commented on code in PR #4488:
URL: https://github.com/apache/calcite/pull/4488#discussion_r2255751245
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core/src/test/java/org/apache/calcite/test/RexImplicationCheckerTest.java:
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@@ -361,6 +366,59 @@ public class RexImplicationCheckerTest {
hasToString("2014"));
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-7122";>[CALCITE-7122]
+ * Eliminate nested calls for idempotent unary functions
UPPER/LOWER/ABS/INITCAP</a>. */
+ @Test void testSimplifyIdempotentUnaryFunctions() {
Review Comment:
Can you demonstrate this simplification capability using toSql? For example,
if you write select `upper(upper(lower(lower('x'))))` it can be simplified to
`upper(lower('x'))`. This kind of test is not very easy to understand.
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