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https://issues.apache.org/jira/browse/DRILL-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092437#comment-15092437
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Venki Korukanti commented on DRILL-4256:
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There are two commits related to hbase-hive backed tables. One commit went in
1.4 and other one ({{76f41e18}} recently (which is a problem only reproed when
native reader is enabled).
> Performance regression in hive planning
> ---------------------------------------
>
> Key: DRILL-4256
> URL: https://issues.apache.org/jira/browse/DRILL-4256
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Hive, Query Planning & Optimization
> Affects Versions: 1.5.0
> Reporter: Rahul Challapalli
>
> Commit # : 76f41e18207e3e3e987fef56ee7f1695dd6ddd7a
> The fix for reading hive tables backed by hbase caused a performance
> regression. The data set used in the below test has ~3700 partitions and the
> filter in the query would ensure only 1 partition get selected.
> {code}
> Commit : 76f41e18207e3e3e987fef56ee7f1695dd6ddd7a
> Query : explain plan for select count(*) from lineitem_partitioned where
> `year`=2015 and `month`=1 and `day` =1;
> Time : ~25 seconds
> {code}
> {code}
> Commit : 1ea3d6c3f144614caf460648c1c27c6d0f5b06b8
> Query : explain plan for select count(*) from lineitem_partitioned where
> `year`=2015 and `month`=1 and `day` =1;
> Time : ~6.5 seconds
> {code}
> Since the data is large, I couldn't attach it here. Reach out to me if you
> need additional information.
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