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https://issues.apache.org/jira/browse/DRILL-4486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15184349#comment-15184349
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ASF GitHub Bot commented on DRILL-4486:
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Github user asfgit closed the pull request at:
https://github.com/apache/drill/pull/412
> Expression serializer incorrectly serializes escaped characters
> ---------------------------------------------------------------
>
> Key: DRILL-4486
> URL: https://issues.apache.org/jira/browse/DRILL-4486
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Steven Phillips
> Assignee: Steven Phillips
>
> the drill expression parser requires backslashes to be escaped. But the
> ExpressionStringBuilder is not properly escaping them. This causes problems,
> especially in the case of regex expressions run with parallel execution.
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