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https://issues.apache.org/jira/browse/CALCITE-3412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952187#comment-16952187
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Julian Hyde commented on CALCITE-3412:
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[~danny0405] I don't know how this function is supposed to know what is the
start day of the week. Maybe we should not allow 'FLOOR(... TO WEEK)'. Do any
databases support it? If so, how do they know which is the first day of the
week?
> Response Error for FLOOR TIMESTAMP TO WEEK
> -------------------------------------------
>
> Key: CALCITE-3412
> URL: https://issues.apache.org/jira/browse/CALCITE-3412
> Project: Calcite
> Issue Type: Bug
> Components: core
> Environment: mac,linux
> Reporter: huaicui
> Priority: Major
> Attachments: image-2019-10-15-13-33-34-896.png
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Floor timestamp to week exist error:
> The start day of the week is not Sunday or Monday, calcite use Thursday to
> split a week.
> Example:
> sql: select FLOOR(CAST('2017-01-28' AS TIMESTAMP) TO WEEK);
> Response:
> 2017-01-26 00:00:00.0
>
> 2017-01-26 is Tuesday that is not our expect result. As result, 2017-01-22 is
> the first day that we expect.
>
>
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