NobiGo commented on code in PR #3845:
URL: https://github.com/apache/calcite/pull/3845#discussion_r1667214622


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core/src/test/java/org/apache/calcite/test/RelBuilderTest.java:
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@@ -2317,6 +2318,69 @@ private static RelNode groupIdRel(RelBuilder builder, 
boolean extra) {
     assertThat(root, hasTree(expected));
   }
 
+  @ParameterizedTest
+  @ValueSource(booleans = {false, true})
+  void testUnionTypeDerivation(boolean all) {
+    final RelBuilder builder = RelBuilder.create(config().build());

Review Comment:
   Hi @vbarua , I find some test in 
https://github.com/apache/calcite/blob/main/core/src/test/java/org/apache/calcite/test/JdbcTest.java#L4525-L4526
 . Looks it is a good please for this tests.



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