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https://issues.apache.org/jira/browse/CALCITE-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17986535#comment-17986535
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xiong duan commented on CALCITE-815:
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1)I noticed that in the current PR, the EMPTY_STRING_IS_NULL method has been
newly created. I think it would be better to implement the same semantics using
the CASE WHEN statement, and then the corresponding function can be pushed down
during the sql-dialect transformation process.
2)The corresponding function return type needs to be corrected, and to ensure
its validity, the necessary conversions should be performed during the Rex2Rex
or SqlNode2Rex processes.
> 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
>
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