NobiGo commented on code in PR #3873:
URL: https://github.com/apache/calcite/pull/3873#discussion_r1685363908


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core/src/test/java/org/apache/calcite/test/TypeCoercionTest.java:
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@@ -105,21 +105,21 @@ private static ImmutableList<RelDataType> combine(
     final Fixture f = fixture();
     f.checkCommonType(f.nullType, f.nullType, f.nullType, true);
     // BOOLEAN
-    f.checkCommonType(f.nullType, f.booleanType, f.booleanType, true);
+    f.checkCommonType(f.nullType, f.booleanType, f.nullableBooleanType, true);

Review Comment:
   @caicancai Please check this test. Before this PR, we thought NULL and 
Boolean's common type was Boolean. After this PR. The common types will be 
nullableBoolean.



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