JiajunBernoulli commented on code in PR #2878:
URL: https://github.com/apache/calcite/pull/2878#discussion_r956554171
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core/src/main/java/org/apache/calcite/sql/type/ReturnTypes.java:
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@@ -347,6 +347,13 @@ public static SqlCall stripSeparator(SqlCall call) {
public static final SqlReturnTypeInference CHAR =
explicit(SqlTypeName.CHAR);
+ /**
+ * Type-inference strategy whereby the result type of a call is a nullable
+ * Char.
+ */
+ public static final SqlReturnTypeInference CHAR_FORCE_NULLABLE =
+ CHAR.andThen(SqlTypeTransforms.FORCE_NULLABLE);
+
Review Comment:
Changed to it.
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