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https://issues.apache.org/jira/browse/DRILL-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15946514#comment-15946514
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ASF GitHub Bot commented on DRILL-5395:
---------------------------------------
GitHub user ppadma opened a pull request:
https://github.com/apache/drill/pull/803
DRILL-5395: Query on MapR-DB table fails with NPE due to an issue wit…
… counts
See [DRILL-5395](https://issues.apache.org/jira/browse/DRILL-5395) for
details.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ppadma/drill DRILL-5395
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/803.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 #803
----
commit 1a21d4a9ddfeb5f06a3224016d7925ccfc135e75
Author: Padma Penumarthy <[email protected]>
Date: 2017-03-28T22:08:54Z
DRILL-5395: Query on MapR-DB table fails with NPE due to an issue with
assignment logic
----
> Query on MapR-DB table fails with NPE due to an issue with assignment logic
> ---------------------------------------------------------------------------
>
> Key: DRILL-5395
> URL: https://issues.apache.org/jira/browse/DRILL-5395
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization, Storage - MapRDB
> Affects Versions: 1.9.0, 1.10.0
> Reporter: Abhishek Girish
> Assignee: Padma Penumarthy
> Labels: MapR-DB-Binary
> Fix For: 1.11.0
>
> Attachments: drillbit.log.txt
>
>
> We uncovered this issue when working on DRILL-5394.
> The MapR-DB table in question had 5 tablets with skewed data distribution (~6
> million rows). A partial WIP fix for DRILL-5394 caused the number of rows to
> be reported incorrectly (~300,000). 2 minor fragments were created (due to
> filter selectivity) for scanning the 5 tablets. And this resulted in an NPE,
> possibly related to an issue with assignment logic, that was now exposed.
> Representative query:
> {code}
> SELECT Convert_from(avail.customer, 'UTF8') AS ABC,
> Convert_from(prop.customer, 'UTF8') AS PQR
> FROM (SELECT Convert_from(a.row_key, 'UTF8')
> AS customer,
> Cast(Convert_from(a.data .` l_discount ` , 'double_be') AS
> FLOAT)
> AS availability
> FROM db.tpch_maprdb.lineitem_1 a
> WHERE Convert_from(a.row_key, 'UTF8') = '%004%') AS avail
> join
> (SELECT Convert_from(b.row_key, 'UTF8')
> AS customer,
> Cast(
> Convert_from(b.data .` l_discount ` , 'double_be') AS FLOAT) AS
> availability
> FROM db.tpch_maprdb.lineitem_1 b
> WHERE Convert_from(b.row_key, 'UTF8') LIKE '%003%') AS prop
> ON avail.customer = prop.customer;
> {code}
> Error:
> {code}
> org.apache.drill.common.exceptions.UserException: SYSTEM ERROR:
> NullPointerException
> {code}
> Log attached.
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