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https://issues.apache.org/jira/browse/CALCITE-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18003974#comment-18003974
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Mihai Budiu commented on CALCITE-815:
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Handling functions is the easy part (although I don't think changing the
function type signature for other dialects is acceptable).
But what about '' = ''? This is currently true, but NULL != NULL. This will
affect the semantics of JOIN and GROUP BY.
What is the design for handling these cases?
> 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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