JiajunBernoulli commented on code in PR #3237:
URL: https://github.com/apache/calcite/pull/3237#discussion_r1225024684
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core/src/main/java/org/apache/calcite/sql/type/ReturnTypes.java:
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@@ -427,6 +427,13 @@ public static SqlCall stripSeparator(SqlCall call) {
public static final SqlReturnTypeInference VARCHAR_2000_NULLABLE =
VARCHAR_2000.andThen(SqlTypeTransforms.TO_NULLABLE);
+ /**
+ * Type-inference strategy that always returns "VARCHAR" with nulls
+ * allowed if any of the operands allow nulls.
+ */
+ public static final SqlReturnTypeInference VARCHAR_NULLABLE =
Review Comment:
Can we declare another `VARCHAR`?
Because
`VARCHAR_4` -> `VARCHAR_4_NULLABLE`;
`VARCHAR_2000` -> `VARCHAR_2000_NULLABLE`;
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