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https://issues.apache.org/jira/browse/DRILL-4503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15192566#comment-15192566
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ASF GitHub Bot commented on DRILL-4503:
---------------------------------------
GitHub user amansinha100 opened a pull request:
https://github.com/apache/drill/pull/428
DRILL-4503: Write nulls as varchar when all_text_mode is enabled.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/amansinha100/incubator-drill DRILL-4503
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/428.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #428
----
commit 882dc2dc66383d41867f18626443b6e2e81c8ea3
Author: Aman Sinha <[email protected]>
Date: 2016-03-13T22:42:57Z
DRILL-4503: Write nulls as varchar when all_text_mode is enabled.
----
> 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
> Labels: 1.7.0
> 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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