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https://issues.apache.org/jira/browse/FLINK-10463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675252#comment-16675252
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ASF GitHub Bot commented on FLINK-10463:
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twalthr 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-435897796
@xccui I think we don't need to keep the expression syntax "strongly
consistent". Internally, the syntax has been more and more complicated but from
an API perspective it should not have become more complex. In most cases the
syntax is equivalent with the Scala syntax. We should only cover big
differences.
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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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