[jira] [Commented] (FLINK-10463) Null literal cannot be properly parsed in Java Table API function call

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-10463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16673973#comment-16673973 ] 

ASF GitHub Bot commented on FLINK-10463:
----------------------------------------

xccui commented on issue #6888: [FLINK-10463][table] Null literal cannot be properly parsed in Java Table API function call
URL: https://github.com/apache/flink/pull/6888#issuecomment-435572138
 
 
   Sorry for the late response @hequn8128. As illustrated in [this stackoverflow question](https://stackoverflow.com/questions/26453870/scala-packratparsers-does-not-backtrack-as-it-should), patterns reordering could be the proper way to deal with this problem. +1 to your solution.
   
   BTW, @twalthr, it seems that the doc for expression syntax in `TableAPI.md` has not been maintained for a long time. As the syntax being more and more complicated, do you think we should still keep them “strongly consistent” with the codes? 

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> Null literal cannot be properly parsed in Java Table API function call
> ----------------------------------------------------------------------
>
>                 Key: FLINK-10463
>                 URL: https://issues.apache.org/jira/browse/FLINK-10463
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>            Reporter: Xingcan Cui
>            Assignee: Hequn Cheng
>            Priority: Major
>              Labels: pull-request-available
>
> For example, the expression `Null(STRING).regexpReplace('oo|ar', '')` throws the following exception.
> {code:java}
> org.apache.flink.table.api.ExpressionParserException: Could not parse expression at column 13: string matching regex `(?i)\Qas\E(?![_$\p{javaJavaIdentifierPart}])' expected but `.' found
> Null(STRING).regexpReplace('oo|ar', '')
>             ^
> 	at org.apache.flink.table.expressions.ExpressionParser$.throwError(ExpressionParser.scala:576)
> 	at org.apache.flink.table.expressions.ExpressionParser$.parseExpression(ExpressionParser.scala:569)
> {code}



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