mihaibudiu commented on code in PR #4070:
URL: https://github.com/apache/calcite/pull/4070#discussion_r1864434402
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testkit/src/main/java/org/apache/calcite/sql/test/SqlOperatorFixture.java:
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@@ -344,6 +344,18 @@ void checkString(
*/
void checkNull(String expression);
+ /**
+ * Tests that a SQL expression returns the SQL NULL value and
+ * returns the data type is NULLABLE. For example,
Review Comment:
and the data type of the returned result is nullable
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