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https://issues.apache.org/jira/browse/CALCITE-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16535971#comment-16535971
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Julian Hyde commented on CALCITE-2396:
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I can see a way to reduce the complexity of the method; can you please remove
the common code before and after the "default:".
> TIMESTAMPADD and DATETIME_PLUS should allow NULL intervals
> ----------------------------------------------------------
>
> Key: CALCITE-2396
> URL: https://issues.apache.org/jira/browse/CALCITE-2396
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.16.0
> Reporter: James Duong
> Assignee: Julian Hyde
> Priority: Major
>
> TIMESTAMPADD(<time_unit>, NULL, <datetime>) and <datetime> + NULL should be
> permitted and return NULL.
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