asolimando commented on code in PR #4371:
URL: https://github.com/apache/calcite/pull/4371#discussion_r2086650109
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core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java:
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@@ -354,6 +354,32 @@ private static boolean skipItem(RexNode expr) {
.check();
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-6887";>[CALCITE-6887]
+ * ReduceExpressionsRule applied to 'IN subquery' should make the values
distinct
+ * if the subquery is a constant Values</a>. */
+ @Test void testReduceInValues() {
+ final String sql = "SELECT deptno, sal "
+ + "FROM EMP "
+ + "WHERE deptno IN (1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1)";
Review Comment:
I'd make the test simpler (no need for that many ending `1`s, a couple
suffice) and add more tests around edge cases (rule is no-op if no duplicates,
multiple duplicate values, nulls, etc)
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