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https://issues.apache.org/jira/browse/CALCITE-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18007595#comment-18007595
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Julian Hyde commented on CALCITE-815:
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One way is to make sure that empty strings are never created and NULL is always
created instead. That means creating alternate versions of all functions that
may produce empty strings, and also changing every empty string literal in a
query AST to NULL.
> 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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