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https://issues.apache.org/jira/browse/CALCITE-5761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730186#comment-17730186
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Tanner Clary commented on CALCITE-5761:
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[~mbudiu] I believe you could set breakpoints
[here|https://github.com/apache/calcite-avatica/blob/main/core/src/main/java/org/apache/calcite/avatica/util/DateTimeUtils.java#L1006]
and
[here|https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java#L3678]
and one of these two should be where the actual math occurs. Let me know if
this helps.
> DATE_TRUNC compile-time evaluation produces wrong results
> ---------------------------------------------------------
>
> Key: CALCITE-5761
> URL: https://issues.apache.org/jira/browse/CALCITE-5761
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0
> Reporter: Mihai Budiu
> Priority: Minor
>
> Adding the following 3 tests to SqlOperatorTest.testDateTrunc produces
> assertion failures.
> f.checkScalar("date_trunc(date '2015-02-19', decade)",
> "2010-01-01", "DATE NOT NULL");
> f.checkScalar("date_trunc(date '2015-02-19', century)",
> "2001-01-01", "DATE NOT NULL");
> f.checkScalar("date_trunc(date '2015-02-19', millennium)",
> "1001-01-01", "DATE NOT NULL");
> Results produced:
> Query: values (date_trunc(date '2015-02-19', decade))
> Expected: is "2010-01-01"
> but: was "2015-01-05"
> Query: values (date_trunc(date '2015-02-19', century))
> Expected: is "2001-01-01"
> but: was "2012-09-17"
> Query: values (date_trunc(date '2015-02-19', millennium))
> Expected: is "1001-01-01"
> but: was "2002-11-09"
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