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https://issues.apache.org/jira/browse/HIVE-19557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich updated HIVE-19557:
------------------------------------
Status: Patch Available (was: Open)
> stats: filters for dates are taking advantage of min/max values
> ---------------------------------------------------------------
>
> Key: HIVE-19557
> URL: https://issues.apache.org/jira/browse/HIVE-19557
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Attachments: HIVE-19557.01.patch
>
>
> in StatsRulesProcFactory
> [https://github.com/apache/hive/blob/ab189f54047bbf6beeeaf8d0dcfd5fbe92e465fb/ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java#L754|dates
> are assumed to be an integer]; however this is currently not true - and the
> resulting exception is handled as a default case... for N/3
> {code}
> set hive.explain.user=true;
> create table d1(d date);
> -- tblproperties('transactional'='false');
> insert into d1 values
> ('2010-10-01'),
> ('2010-10-02'),
> ('2010-10-03'),
> ('2010-10-04'),
> ('2010-10-05'),
> ('2010-10-06'),
> ('2010-10-07'),
> ('2010-10-08'),
> ('2010-10-09'),
> ('2010-10-10');
> analyze table d1 compute statistics for columns;
> desc formatted d1;
> desc formatted d1 d;
> explain
> select 'stats: FIL ~0 read',count(1) from d1 where d < '2010-03-01';
> explain
> select 'stats: FIL estimate some read',count(1) from d1 where d <
> '2010-10-03';
> explain
> select 'stats: FIL estimate all read',count(1) from d1 where d < '2010-11-03';
> {code}
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