[jira] [Assigned] (DRILL-4503) Schema change exception even with all_text_mode enabled

["Pritesh Maker (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-4503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pritesh Maker reassigned DRILL-4503:
------------------------------------

    Assignee: Aman Sinha  (was: Padma Penumarthy)
    Reviewer: Padma Penumarthy

> Schema change exception even with all_text_mode enabled
> -------------------------------------------------------
>
>                 Key: DRILL-4503
>                 URL: https://issues.apache.org/jira/browse/DRILL-4503
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - JSON
>    Affects Versions: 1.6.0
>            Reporter: Aman Sinha
>            Assignee: Aman Sinha
>             Fix For: Future
>
>         Attachments: mostlynulls_1.json
>
>
> Both HashAggregate and StreamingAggregate encounter schema change error whey querying a JSON file with non-null values for column 'a' and many null values for column 'c'.
> This occurs even when all_text_mode is enabled, which seems counterintuitive since once all_text_mode is enabled, everything (including nulls) should be treated as varchar and one would expect no schema change errors.  
> Here are some example queries that encounter this error: 
> {noformat}
> 0: jdbc:drill:zk=local> select a, c from dfs.`mostlynulls_1.json` group by a, c;
> Error: UNSUPPORTED_OPERATION ERROR: Hash aggregate does not support schema changes
> 0: jdbc:drill:zk=local> alter session set `store.json.all_text_mode` = true;
> +-------+------------------------------------+
> |  ok   |              summary               |
> +-------+------------------------------------+
> | true  | store.json.all_text_mode updated.  |
> +-------+------------------------------------+
> 1 row selected (0.15 seconds)
> 0: jdbc:drill:zk=local> select a, c from dfs.`mostlynulls_1.json` group by a, c;
> Error: UNSUPPORTED_OPERATION ERROR: Hash aggregate does not support schema changes
> 0: jdbc:drill:zk=local> select min(a), min(c) from dfs.`mostlynulls_1.json`;
> Error: UNSUPPORTED_OPERATION ERROR: Streaming aggregate does not support schema changes
> {noformat}



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