hequn8128 commented on a change in pull request #6432: [FLINK-9970] Add
ASCII/CHR function for table/sql API
URL: https://github.com/apache/flink/pull/6432#discussion_r205932695
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
##########
@@ -544,11 +544,22 @@ trait ImplicitExpressionOperations {
def overlay(newString: Expression, starting: Expression, length: Expression)
=
Overlay(expr, newString, starting, length)
+ /**
+ * Returns the numeric value of the leftmost character of the string.
+ */
+ def ascii() = Ascii(expr)
+
/**
* Returns the base string decoded with base64.
*/
def fromBase64() = FromBase64(expr)
+ /*
+ * Returns string contains a character which converts from a ASCII integer.
Review comment:
Returns the character corresponding to the input ASCII integer. If the
ASCII code less then 0 or greater than 255, returns null.
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