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_r205524700
##########
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.
+ * Returns NULL If the input string is NULL.
+ */
+case class ToBase64(child: Expression) extends UnaryExpression with
InputTypeSpec {
+
+ override private[flink] def expectedTypes: Seq[TypeInformation[_]] =
Seq(STRING_TYPE_INFO)
+
+ override private[flink] def resultType: TypeInformation[_] = STRING_TYPE_INFO
+
+ override private[flink] def validateInput(): ValidationResult = {
+ if (child.resultType == STRING_TYPE_INFO) {
+ ValidationSuccess
+ } else {
+ ValidationFailure(s"ToBase64 operator requires String input, " +
Review comment:
ToBase64 operator requires **a** String input
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