xiedeyantu commented on code in PR #4303:
URL: https://github.com/apache/calcite/pull/4303#discussion_r2041282551


##########
testkit/src/main/java/org/apache/calcite/test/MockSqlOperatorTable.java:
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@@ -208,6 +213,39 @@ public DedupFunction() {
     }
   }
 
+  /** "TEST" user-defined table function. */
+  public static class TestTableFunction extends SqlFunction

Review Comment:
   The purpose of this TestTableFunction is to illustrate how this rule works, 
since none of the existing TableFunctions can properly demonstrate its effect.



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