JiajunBernoulli commented on code in PR #3260:
URL: https://github.com/apache/calcite/pull/3260#discussion_r1232926360
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core/src/main/java/org/apache/calcite/sql/type/ReturnTypes.java:
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@@ -177,6 +177,14 @@ public static SqlCall stripSeparator(SqlCall call) {
public static final SqlReturnTypeInference ARG0_NULLABLE =
ARG0.andThen(SqlTypeTransforms.TO_NULLABLE);
+ /**
+ * Type-inference strategy whereby the result type of a call is the type of
+ * the operand #0 (0-based). If the operand #0 (0-based) is nullable, the
+ * returned type will also be nullable.
+ */
+ public static final SqlReturnTypeInference ARG0_NULLABLE_IF_ARG0_NULLABLE =
Review Comment:
Does it be used?
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