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https://issues.apache.org/jira/browse/CALCITE-4040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17125584#comment-17125584
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xzh_dz commented on CALCITE-4040:
---------------------------------
[~donnyzone] Thanks for review. Some aggregate functions does not support roll
up, it will throw an exception.For example, `stddev_pop` aggregate function
does not support roll up.
> Nonstandard SqlAggFunction rollup NPE Exception
> -----------------------------------------------
>
> Key: CALCITE-4040
> URL: https://issues.apache.org/jira/browse/CALCITE-4040
> Project: Calcite
> Issue Type: Wish
> Reporter: xzh_dz
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> When i try to rollup some SqlAggFunctions in my project,I find something
> wrong.
> A case can be reproduced as below:
> MaterializationTest:
> {code:java}
> @Test public void testSqlAggFunctionRollup() {
> checkNoMaterialize(
> "select \"empid\", stddev_pop(\"deptno\") from \"emps\" group by
> \"empid\", \"deptno\"",
> "select \"empid\", stddev_pop(\"deptno\") from \"emps\" group by
> \"empid\"",
> HR_FKUK_MODEL);
> }
> {code}
> If sql is not materialized, it should not throw an exception.
> Exception:
> {code:java}
> java.sql.SQLException: Error while executing SQL "explain plan for select
> "empid", stddev_pop("deptno") from "emps" group by "empid"": null
> at org.apache.calcite.avatica.Helper.createException(Helper.java:56)
> at org.apache.calcite.avatica.Helper.createException(Helper.java:41)
> at
> org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:163)
> at
> org.apache.calcite.avatica.AvaticaStatement.executeQuery(AvaticaStatement.java:227)
> at
> org.apache.calcite.test.CalciteAssert.assertQuery(CalciteAssert.java:528)
> Caused by: java.lang.NullPointerException
> at java.util.Objects.requireNonNull(Objects.java:203)
> at
> org.apache.calcite.rel.core.AggregateCall.<init>(AggregateCall.java:98)
> at
> org.apache.calcite.rel.core.AggregateCall.create(AggregateCall.java:198)
> at
> org.apache.calcite.plan.SubstitutionVisitor.unifyAggregates(SubstitutionVisitor.java:1854)
> at
> org.apache.calcite.plan.SubstitutionVisitor$AggregateToAggregateUnifyRule.apply(SubstitutionVisitor.java:1545)
> at
> org.apache.calcite.plan.SubstitutionVisitor.go(SubstitutionVisitor.java:544)
> at
> org.apache.calcite.plan.SubstitutionVisitor.go(SubstitutionVisitor.java:478)
> {code}
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