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https://issues.apache.org/jira/browse/CALCITE-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15819216#comment-15819216
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Julian Hyde commented on CALCITE-815:
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See the REPLACE function, added in CALCITE-420. It should return null values if
{{SqlConformance#emptyStringIsNull}}.
> 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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