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https://issues.apache.org/jira/browse/FLINK-9853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578171#comment-16578171
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ASF GitHub Bot commented on FLINK-9853:
---------------------------------------
twalthr commented on a change in pull request #6337: [FLINK-9853] [table] Add
HEX support
URL: https://github.com/apache/flink/pull/6337#discussion_r209582133
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/mathExpressions.scala
##########
@@ -422,3 +422,21 @@ case class Bin(child: Expression) extends UnaryExpression
{
relBuilder.call(ScalarSqlFunctions.BIN, child.toRexNode)
}
}
+
+case class Hex(child: Expression) extends UnaryExpression {
+ override private[flink] def resultType: TypeInformation[_] =
BasicTypeInfo.STRING_TYPE_INFO
+
+ override private[flink] def validateInput(): ValidationResult =
child.resultType match {
+ case _: IntegerTypeInfo[_] =>
Review comment:
Rely on `TypeCheckUtils.isIntegerFamily` and `TypeCheckUtils#isString`
instead.
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> add hex support in table api and sql
> ------------------------------------
>
> Key: FLINK-9853
> URL: https://issues.apache.org/jira/browse/FLINK-9853
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: xueyu
> Priority: Major
> Labels: pull-request-available
>
> like in mysql, HEX could take int or string arguments, For a integer argument
> N, it returns a hexadecimal string representation of the value of N. For a
> string argument str, it returns a hexadecimal string representation of str
> where each byte of each character in str is converted to two hexadecimal
> digits.
> Syntax:
> HEX(100) = 64
> HEX('This is a test String.') = '546869732069732061207465737420537472696e672e'
> See more: [link
> MySQL|https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_hex]
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