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https://issues.apache.org/jira/browse/KYLIN-5721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17786687#comment-17786687
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Hongrong Cao commented on KYLIN-5721:
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h2. Dev design
timestampdiff, timestampadd are spark built-in functions implemented in KE, as
long as you add implicit conversion, you can automatically convert to string;
By changing the checker of the timestampadd/diff functions in calcite, the
requirement of checking the parameters is relaxed to allow date strings to be
passed;
MINUTE, SECOND, HOUR, EXTRACT do not support constant queries, so they are not
supported for the time being.
> The input parameters of some date functions support string format
> -----------------------------------------------------------------
>
> Key: KYLIN-5721
> URL: https://issues.apache.org/jira/browse/KYLIN-5721
> Project: Kylin
> Issue Type: Improvement
> Affects Versions: 5.0-beta
> Reporter: Hongrong Cao
> Assignee: Hongrong Cao
> Priority: Critical
> Fix For: 5.0.0
>
>
> date_trunc
> date_trunc
> minute
> date_trunc
> extract
> These functions hopefully also implement date strings as arguments.
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