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https://issues.apache.org/jira/browse/CALCITE-3894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17076504#comment-17076504
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Julian Hyde commented on CALCITE-3894:
--------------------------------------
There might be a wider problem than just DATE and TIMESTAMP. Please test some
other implicit coercions as well.
> The Union operation between DATE with TIMESTAMP returns a wrong result
> ----------------------------------------------------------------------
>
> Key: CALCITE-3894
> URL: https://issues.apache.org/jira/browse/CALCITE-3894
> Project: Calcite
> Issue Type: Bug
> Reporter: TANG Wen-hui
> Assignee: TANG Wen-hui
> Priority: Major
>
> {code:java}
> @Test public void testUnionTime() {
> CalciteAssert.AssertThat assertThat = CalciteAssert.that();
> String query = "select * from (\n"
> + "select \"id\" from (VALUES(DATE '2018-02-03')) \"foo\"(\"id\")\n"
> + "union\n"
> + "select \"id\" from (VALUES(TIMESTAMP '2008-03-31 12:23:34'))
> \"foo\"(\"id\"))";
> assertThat.query(query).returns("id=2108-03-12\nid=2018-02-03\n");
> }{code}
> The test with wrong result passed.
>
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