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https://issues.apache.org/jira/browse/CALCITE-1793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16013520#comment-16013520
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Julian Hyde commented on CALCITE-1793:
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[~chris-baynes], Let's continue discussion in this JIRA case. Hopefully you saw
my design hints on the mail thread. They're only hints, and I can't say with
absolute certainty that I am not sending you down the wrong path. So, if it's
not making sense please holler.
> Allow RelBuilder to make calls to EXTRACT
> -----------------------------------------
>
> Key: CALCITE-1793
> URL: https://issues.apache.org/jira/browse/CALCITE-1793
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.11.0, 1.12.0
> Reporter: Chris Baynes
> Assignee: Julian Hyde
> Priority: Minor
>
> EXTRACT_DATE was originally intended to be an internal function, always
> created by translating a call to EXTRACT.
> Currently this makes the EXTRACT_DATE function rather awkward to use:
> {code}
> SqlOperator op = new SqlSpecialOperator("EXTRACT_DATE", SqlKind.EXTRACT, 2,
> true, ReturnTypes.INTEGER, null, null);
> builder.call(op, builder.getRexBuilder().makeFlag(TimeUnitRange.YEAR),
> builder.field(1, 0, "my_date"));
> {code}
> [~julianhyde] suggests calling EXTRACT directly and then have RelBuilder
> invoke a convertlet to translate into calls to EXTRACT_DATE or date-time
> arithmetic.
> Mailing list discussion:
> [http://mail-archives.apache.org/mod_mbox/calcite-dev/201705.mbox/%3CCAPSgeET9OVWkvGsGXAezqhqP3Zd2dmXxs0k-J92WZM32%2BMq3kw%40mail.gmail.com%3E]
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