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https://issues.apache.org/jira/browse/DRILL-4783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15382645#comment-15382645
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ASF GitHub Bot commented on DRILL-4783:
---------------------------------------
GitHub user chunhui-shi opened a pull request:
https://github.com/apache/drill/pull/546
DRILL-4783: flatten operator should not throw exception if there is empty
resultset
returned for underlying operator which is convert_from or other complex
functions.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chunhui-shi/drill DRILL-4783-flatten
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/546.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 #546
----
commit 88dc26dfeb7f47ded0bfdc4c7f89e6bc55520344
Author: chunhui-shi <[email protected]>
Date: 2016-07-16T07:18:33Z
DRILL-4783: flatten operator handle empty resultset(and schema unknown due
to this)
----
> Flatten on CONVERT_FROM fails with ClassCastException if resultset is empty
> ---------------------------------------------------------------------------
>
> Key: DRILL-4783
> URL: https://issues.apache.org/jira/browse/DRILL-4783
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Chunhui Shi
> Assignee: Chunhui Shi
> Priority: Critical
>
> Flatten failed to work on top of convert_from when the resultset is empty.
> For a HBase table like this:
> 0: jdbc:drill:zk=localhost:5181> select convert_from(t.address.cities,'json')
> from hbase.`/tmp/flattentest` t;
> +----------------------------------------------------------------------------------+
> | EXPR$0
> |
> +----------------------------------------------------------------------------------+
> | {"list":[{"city":"SunnyVale"},{"city":"Palo Alto"},{"city":"Mountain
> View"}]} |
> | {"list":[{"city":"Seattle"},{"city":"Bellevue"},{"city":"Renton"}]}
> |
> | {"list":[{"city":"Minneapolis"},{"city":"Falcon Heights"},{"city":"San
> Paul"}]} |
> +----------------------------------------------------------------------------------+
> Flatten works when row_key is in (1,2,3)
> 0: jdbc:drill:zk=localhost:5181> select flatten(t1.json.list) from (select
> convert_from(t.address.cities,'json') json from hbase.`/tmp/flattentest` t
> where row_key=1) t1;
> +---------------------------+
> | EXPR$0 |
> +---------------------------+
> | {"city":"SunnyVale"} |
> | {"city":"Palo Alto"} |
> | {"city":"Mountain View"} |
> +---------------------------+
> But Flatten throws exception if the resultset is empty
> 0: jdbc:drill:zk=localhost:5181> select flatten(t1.json.list) from (select
> convert_from(t.address.cities,'json') json from hbase.`/tmp/flattentest` t
> where row_key=4) t1;
> Error: SYSTEM ERROR: ClassCastException: Cannot cast
> org.apache.drill.exec.vector.NullableIntVector to
> org.apache.drill.exec.vector.complex.RepeatedValueVector
> Fragment 0:0
> [Error Id: 07fd0cab-d1e6-4259-bfec-ad80f02d93a2 on atsqa4-127.qa.lab:31010]
> (state=,code=0)
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