danny0405 commented on a change in pull request #2135:
URL: https://github.com/apache/calcite/pull/2135#discussion_r483401748
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File path: core/src/main/java/org/apache/calcite/rel/type/RelDataTypeImpl.java
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@@ -217,6 +217,12 @@ public int getScale() {
return SCALE_NOT_SPECIFIED;
}
+ /**
+ * Gets the {@link SqlTypeName} of this type.
+ * Sub-classes must override the method to ensure the resulting value is
non-nullable.
+ *
+ * @return SqlTypeName, never null
+ */
public SqlTypeName getSqlTypeName() {
return null;
Review comment:
I'm afraid no any default value is suitable here, for example
`SqlTypeName .ANY`, because each `SqlTypeName` has a specific semantic, there
is no default, returns a default value will cause confusion in some cases.
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