caicancai commented on code in PR #3873:
URL: https://github.com/apache/calcite/pull/3873#discussion_r1685248328
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core/src/test/java/org/apache/calcite/test/TypeCoercionTest.java:
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@@ -638,22 +638,39 @@ static class Fixture {
// single types
final RelDataType nullType;
final RelDataType booleanType;
+ final RelDataType nullableBooleanType;
Review Comment:
Should JavaDoc be added here to explain the difference from nulltype?
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