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https://issues.apache.org/jira/browse/CALCITE-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15747150#comment-15747150
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Julian Hyde commented on CALCITE-815:
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It's mainly the built-in functions that can convert non-empty strings to empty
strings, and vice versa. E.g. substring can convert a non-empty string to an
empty string. In Oracle-compatible mode its type needs to be nullable, and it
needs to return a null (or whatever the representation of empty string is going
to be).
> 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: Maryann Xue
> Assignee: Julian Hyde
> Labels: phoenix
>
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