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https://issues.apache.org/jira/browse/CALCITE-5050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17508331#comment-17508331
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Julian Hyde commented on CALCITE-5050:
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I agree. "GROUP BY ()" always returns 1 row.
* Add a test that '... where false ... group by ()' also returns 1 row.
* Can you improve the summary and commit message?
* Don't use 'is' when the argument is a float.
> Unexpected rowCount of aggregate without group keys
> ---------------------------------------------------
>
> Key: CALCITE-5050
> URL: https://issues.apache.org/jira/browse/CALCITE-5050
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.29.0, 1.30.0
> Reporter: Jing Zhang
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently, RowCount of aggregate without group keys are unexpected.
> The problem could be appear in the following UT:
> {code:java}
> @Test void testRowCountAggregateEmptyKey1() {
> fixture()
> .withRelFn(b ->
> b.scan("EMP")
> .aggregate(
> b.groupKey(),
> b.count(false, "C"))
> .build())
> .assertThatRowCount(is(1D), is(1D), is(1D));
> }
> {code}
> Now, the above UT would be failed because row count return 1.4D instead of 1D.
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