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https://issues.apache.org/jira/browse/DRILL-7237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837673#comment-16837673
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ASF GitHub Bot commented on DRILL-7237:
---------------------------------------
Ben-Zvi commented on pull request #1782: DRILL-7237: Fix single_value aggregate
function for variable length types
URL: https://github.com/apache/drill/pull/1782
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> IllegalStateException in aggregation function 'single_value' when there is a
> varchar datatype in the subquery results
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-7237
> URL: https://issues.apache.org/jira/browse/DRILL-7237
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.14.0, 1.15.0
> Reporter: Denys Ordynskiy
> Assignee: Volodymyr Vysotskyi
> Priority: Major
> Labels: ready-to-commit
> Fix For: 1.17.0
>
> Attachments: drillbit.log
>
>
> *Description:*
> The following issue can be reproduced on the fix for the
> [DRILL-7050|https://issues.apache.org/jira/browse/DRILL-7050].
> _For the query with > 1 row in subquery results where the data type of these
> results *is not varchar*:_
> {noformat}
> SELECT
> e.full_name,
> (
> SELECT
> ine.employee_id
> FROM
> cp.`employee.json` ine
> WHERE
> ine.position_id = e.position_id
> ) as empl_id
> FROM
> cp.`employee.json` e
> LIMIT 20
> {noformat}
> _We have the following correct and informative error:_
> {noformat}
> Query Failed: An Error Occurred
> org.apache.drill.common.exceptions.UserRemoteException: FUNCTION ERROR: Input
> for single_value function has more than one row Fragment 0:0 [Error Id:
> b770098f-b1c7-4647-9f41-9e986a0e47b7 on maprhost:31010]
> {noformat}
> _But when in the result set of the subquery we have *a varchar data type*:_
> {noformat}
> SELECT
> e.full_name,
> (
> SELECT
> ine.first_name
> FROM
> cp.`employee.json` ine
> WHERE
> ine.position_id = e.position_id
> ) as empl_id
> FROM
> cp.`employee.json` e
> LIMIT 20
> {noformat}
> *Actual result:*
> _Drill throws the following error:_
> {noformat}
> org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR:
> IllegalStateException: Workspace variable 'value' in aggregation function
> 'single_value' is not allowed to have variable length type. Fragment 0:0
> Please, refer to logs for more information. [Error Id:
> 32325ba9-d2b3-4216-acf6-8e80dfe4a56a on maprhost:31010]
> {noformat}
> Log file is in the attachment "drillbit.log"
> *Expected result:*
> Drill should return the same informative error to any of a data types in the
> subquery result set.
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