[jira] [Assigned] (DRILL-6976) SchemaChangeException happens when using split function in subquery if it returns empty result.

["Arina Ielchiieva (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-6976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arina Ielchiieva reassigned DRILL-6976:
---------------------------------------

    Assignee: Bohdan Kazydub

> SchemaChangeException happens when using split function in subquery if it returns empty result.
> -----------------------------------------------------------------------------------------------
>
>                 Key: DRILL-6976
>                 URL: https://issues.apache.org/jira/browse/DRILL-6976
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.15.0
>            Reporter: Anton Gozhiy
>            Assignee: Bohdan Kazydub
>            Priority: Major
>
> *Query:*
> {code:sql}
> select substr(col, 2, 3) 
> from (select split(n_comment, ' ') [3] col 
>       from cp.`tpch/nation.parquet` 
>       where n_nationkey = -1 
>       group by n_comment 
>       order by n_comment 
>       limit 5);
> {code}
> *Expected result:*
> {noformat}
> +---------+
> | EXPR$0  |
> +---------+
> +---------+
> {noformat}
> *Actual result:*
> {noformat}
> Error: SYSTEM ERROR: SchemaChangeException: Failure while trying to materialize incoming schema.  Errors:
>  
> Error in expression at index -1.  Error: Missing function implementation: [castVARCHAR(NULL-OPTIONAL, BIGINT-REQUIRED)].  Full expression: --UNKNOWN EXPRESSION--..
> Fragment 0:0
> Please, refer to logs for more information.
> [Error Id: 86515d74-7b9c-4949-8ece-c9c17e00afc3 on userf87d-pc:31010]
>   (org.apache.drill.exec.exception.SchemaChangeException) Failure while trying to materialize incoming schema.  Errors:
>  
> Error in expression at index -1.  Error: Missing function implementation: [castVARCHAR(NULL-OPTIONAL, BIGINT-REQUIRED)].  Full expression: --UNKNOWN EXPRESSION--..
>     org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.setupNewSchemaFromInput():498
>     org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.setupNewSchema():583
>     org.apache.drill.exec.record.AbstractUnaryRecordBatch.innerNext():101
>     org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext():143
>     org.apache.drill.exec.record.AbstractRecordBatch.next():186
>     org.apache.drill.exec.physical.impl.BaseRootExec.next():104
>     org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext():83
>     org.apache.drill.exec.physical.impl.BaseRootExec.next():94
>     org.apache.drill.exec.work.fragment.FragmentExecutor$1.run():297
>     org.apache.drill.exec.work.fragment.FragmentExecutor$1.run():284
>     java.security.AccessController.doPrivileged():-2
>     javax.security.auth.Subject.doAs():422
>     org.apache.hadoop.security.UserGroupInformation.doAs():1746
>     org.apache.drill.exec.work.fragment.FragmentExecutor.run():284
>     org.apache.drill.common.SelfCleaningRunnable.run():38
>     java.util.concurrent.ThreadPoolExecutor.runWorker():1149
>     java.util.concurrent.ThreadPoolExecutor$Worker.run():624
>     java.lang.Thread.run():748 (state=,code=0)
> {noformat}
> *Note:* Filter "where n_nationkey = -1" doesn't return any rows. In case of " = 1", for example, the query will return result without error.
> *Workaround:* Use cast on the split function, like
> {code:sql}
> cast(split(n_comment, ' ') [3] as varchar)
> {code}



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