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https://issues.apache.org/jira/browse/CALCITE-3530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16979477#comment-16979477
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Rui Wang commented on CALCITE-3530:
-----------------------------------
If need to make Calcite SqlFunction supports beyond millisecond, we will have
to discuss how to pass around values with micros or nanos. A long won't be
enough and it might be a (long, int). To support this kind of format, as to
function parameters, it's relative easy. But I didn't figure it our how to
return (long int) from functions.
> TIMESTAMPADD/TIMESTAMPDIFF with microsecond/nanosecond unit lost precision
> --------------------------------------------------------------------------
>
> Key: CALCITE-3530
> URL: https://issues.apache.org/jira/browse/CALCITE-3530
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Zhenghua Gao
> Priority: Minor
>
> Since the TimestampAddConvertlet and TimestampDiffConvertlet tread TIMESTAMP
> as long (with millisecond precision), they lost precision even if the
> downstream can support microsecond or nanosecond.
>
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