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https://issues.apache.org/jira/browse/CALCITE-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18003746#comment-18003746
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ZheHu commented on CALCITE-815:
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Thanks for your advice, and I've submitted a patch for this feature, which
makes string functions that produce empty strings return null under the new
semantics.
> Add an option to allow empty strings to represent null values
> -------------------------------------------------------------
>
> Key: CALCITE-815
> URL: https://issues.apache.org/jira/browse/CALCITE-815
> Project: Calcite
> Issue Type: New Feature
> Reporter: Wei Xue
> Assignee: ZheHu
> Priority: Major
> Labels: dialect, phoenix, pull-request-available
>
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