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_r205525765
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/stringExpressions.scala
 ##########
 @@ -382,4 +382,32 @@ case class FromBase64(child: Expression) extends 
UnaryExpression with InputTypeS
   }
 
   override def toString: String = s"($child).fromBase64"
+
+}
+
+/**
+  * Returns the string encoded with base64.
 
 Review comment:
   Returns the base64-encoded result of the input string.

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