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https://issues.apache.org/jira/browse/DRILL-2874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14517421#comment-14517421
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Sean Hsuan-Yi Chu commented on DRILL-2874:
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Downgrade to minor because it is about error message.
> Concat operator is not supported with complex types, we should throw an error
> early
> -----------------------------------------------------------------------------------
>
> Key: DRILL-2874
> URL: https://issues.apache.org/jira/browse/DRILL-2874
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 0.9.0
> Reporter: Victoria Markman
> Assignee: Sean Hsuan-Yi Chu
>
> m1 is a map in this example:
> {code}
> 0: jdbc:drill:schema=dfs> select 'abc' || m1 from `t2.json`;
> Query failed: SYSTEM ERROR: Failure while trying to materialize incoming
> schema. Errors:
>
> Error in expression at index -1. Error: Missing function implementation:
> [concatOperator(MAP-REQUIRED, MAP-REQUIRED)]. Full expression: --UNKNOWN
> EXPRESSION--..
> Fragment 0:0
> [dafd9622-17e5-45e1-adef-15fcade2ae03 on atsqa4-133.qa.lab:31010]
> Error: exception while executing query: Failure while executing query.
> (state=,code=0)
> {code}
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