xccui commented on a change in pull request #6390: [FLINK-9915] Add TO_BASE64
function for table/sql API
URL: https://github.com/apache/flink/pull/6390#discussion_r205526999
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/sql/ScalarSqlFunctions.scala
##########
@@ -177,4 +177,13 @@ object ScalarSqlFunctions {
SqlFunctionCategory.STRING
)
+ val TO_BASE64 = new SqlFunction(
+ "TO_BASE64",
+ SqlKind.OTHER_FUNCTION,
+ ReturnTypes.cascade(ReturnTypes.explicit(SqlTypeName.VARCHAR),
SqlTypeTransforms.TO_NULLABLE),
+ InferTypes.RETURN_TYPE,
+ OperandTypes.family(SqlTypeFamily.STRING),
Review comment:
Can directly use `OperandTypes.STRING` here.
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