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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9853) add hex support in table api and sql
Date Mon, 13 Aug 2018 12:03:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578171#comment-16578171
] 

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 &amp; 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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