ILuffZhe commented on code in PR #4462:
URL: https://github.com/apache/calcite/pull/4462#discussion_r2193699819
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core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
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@@ -346,7 +346,7 @@ private static RelDataType deriveTypePad(SqlOperatorBinding
binding, RelDataType
@LibraryOperator(libraries = {BIG_QUERY, ORACLE, POSTGRESQL, SPARK, HIVE})
public static final SqlFunction LTRIM =
SqlBasicFunction.create(SqlKind.LTRIM,
- ReturnTypes.ARG0.andThen(SqlTypeTransforms.TO_NULLABLE)
+ ReturnTypes.ARG0.andThen(SqlTypeTransforms.FORCE_NULLABLE)
Review Comment:
Yes, this makes the functions return null even if no argements is null.
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