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https://issues.apache.org/jira/browse/CALCITE-5957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17759706#comment-17759706
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Julian Hyde commented on CALCITE-5957:
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I don't know what the SQL standard says, or what other DBs do, but I think that
leading zeros should be optional in the input string, and punctuation ('-', '
', ':' are typical in dates and times) should be mandatory. For example, for
DATE values, "1945-02-02" and "1945-2-2" should be valid, and "19450202" and
"194522" should not.
> Valid DATE '1945-2-2' is not accepted due to regression
> -------------------------------------------------------
>
> Key: CALCITE-5957
> URL: https://issues.apache.org/jira/browse/CALCITE-5957
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.35.0
> Reporter: Runkang He
> Priority: Major
> Attachments: image-2023-08-27-19-09-33-284.png
>
>
> DATE '1945-2-2' is a valid date. In CALCITE-5923 when we turn on the result
> check of `testCastStringToDateTime`, we find that Calcite accepted DATE
> '1945-2-2' before CALCITE-5678 but not afterwards, so this is a regression
> that we need to fix.
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