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https://issues.apache.org/jira/browse/FLINK-10463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16676968#comment-16676968
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Xingcan Cui commented on FLINK-10463:
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[~twalthr], sure. I'll cherry-pick the commit to versions 1.6.3 and 1.7.1.
> 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
> Fix For: 1.6.3, 1.8.0, 1.7.1
>
>
> 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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