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https://issues.apache.org/jira/browse/DRILL-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abhishek Girish closed DRILL-5395.
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> 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, ready-to-commit
> 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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