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https://issues.apache.org/jira/browse/IOTDB-1875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17433806#comment-17433806
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Xiangdong Huang commented on IOTDB-1875:
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Hi [~JonWang], I have add permission to allow you assign yourself to take over
any issue on JIRA :D
> Cast exception on invalid nested aggregation function call
> ----------------------------------------------------------
>
> Key: IOTDB-1875
> URL: https://issues.apache.org/jira/browse/IOTDB-1875
> Project: Apache IoTDB
> Issue Type: Improvement
> Reporter: Zhong Wang
> Assignee: Zhong Wang
> Priority: Major
> Labels: pull-request-available
>
> For queries like SELECT first_value(abs(s1)) from root.sg.d1, the following
> exception will be thrown:
> java.lang.ClassCastException:
> org.apache.iotdb.db.query.expression.unary.FunctionExpression cannot be cast
> to org.apache.iotdb.db.query.expression.unary.TimeSeriesOperand
> at
> org.apache.iotdb.db.qp.logical.crud.SelectComponent.getPaths(SelectComponent.java:100)
> at
> org.apache.iotdb.db.qp.logical.crud.QueryOperator.generateRawDataQueryPlan(QueryOperator.java:193)
> at
> org.apache.iotdb.db.qp.logical.crud.GroupByQueryOperator.generatePhysicalPlan(GroupByQueryOperator.java:36)
> at
> org.apache.iotdb.db.qp.strategy.PhysicalGenerator.transformToPhysicalPlan(PhysicalGenerator.java:39)
> at org.apache.iotdb.db.qp.Planner.parseSQLToPhysicalPlan(Planner.java:62)
> at
> org.apache.iotdb.db.service.TSServiceImpl.executeStatement(TSServiceImpl.java:607)
>
> According to the implementation, the argument of built-in aggregation
> functions must be a time series, but this constraint is not checked.
>
> I will fix this issue.
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