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https://issues.apache.org/jira/browse/CALCITE-4345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17218866#comment-17218866
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Jiatao Tao commented on CALCITE-4345:
-------------------------------------
You mean "nullif(count(*) filter (where b), 0)"? Seems works, but
AggregateCaseToFilterRule#transform returns a AggregateCall, seems the change
is not minor.
> SUM CASE WHEN xxx THEN 1 without "ELSE" throws NPE in
> AggregateCaseToFilterRule
> -------------------------------------------------------------------------------
>
> Key: CALCITE-4345
> URL: https://issues.apache.org/jira/browse/CALCITE-4345
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jiatao Tao
> Assignee: Jiatao Tao
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2020-10-19-16-59-44-900.png
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> Add a test in CsvTest:
>
> {code:java}
> @Test void testSumCaseWhenWithoutElse() throws SQLException {
> sql("model", "select sum( CASE WHEN empno=10 THEN 1 END ) from EMPS").ok();
> }
> {code}
> Will throw NPE
>
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