[jira] [Commented] (CALCITE-4282) Promote the window table functions window attribute data type with precision 3

["Julian Hyde (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-4282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202671#comment-17202671 ] 

Julian Hyde commented on CALCITE-4282:
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In Calcite, the default precision of TIMESTAMP is 3. If you want to change the default precision, do it via RelDataTypeSystem.

> Promote the window table functions window attribute data type with precision 3
> ------------------------------------------------------------------------------
>
>                 Key: CALCITE-4282
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4282
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.25.0
>            Reporter: Danny Chen
>            Assignee: Danny Chen
>            Priority: Major
>             Fix For: 1.26.0
>
>
> Now the {{window_start}} and {{window_end}} has a type of a Timestamp with default system precision. But, actually, many DB vendors has default precision as 6 (which is also defined in the SQL standard).
> We better promote the precision to 3 because:
> 1. For windowing, time unit as millisecond is enough
> 2. Make the precision deterministic instead of overriding by each engine's default one



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