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From "Robin Morris (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-4386) max() and min() return NULL on partition column; distinct() returns nothing
Date Fri, 19 Apr 2013 19:47:16 GMT

     [ https://issues.apache.org/jira/browse/HIVE-4386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robin Morris updated HIVE-4386:
-------------------------------

    Description: 
partitioned_table is partitioned on year, month, day.

> select max(day) from partitioned_table where year=2013 and month=4;
spins up zero mappers, one reducer, and returns NULL.  Same for
> select min(day) from ...

> select distinct(day) from... returns nothing at all.

Using an explicit intermediate table does work:
> create table foo_max as select day from partitioned_table where year=2013 and month=4;
 
> select max(day) from foo_max; drop table foo_max;
Several map-reduce jobs later, the correct answer is given.

  was:
partitioned_table is partitioned on year, month, day.

> select max(day) from partitioned_table where year=2013 and month=4;
spins up zero mappers, one reducer, and returns NULL.  Same for
> select min(day) from ...

> select distinct(day) from... returns nothing at all.


    
> max() and min() return NULL on partition column; distinct() returns nothing
> ---------------------------------------------------------------------------
>
>                 Key: HIVE-4386
>                 URL: https://issues.apache.org/jira/browse/HIVE-4386
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF
>    Affects Versions: 0.8.1
>            Reporter: Robin Morris
>
> partitioned_table is partitioned on year, month, day.
> > select max(day) from partitioned_table where year=2013 and month=4;
> spins up zero mappers, one reducer, and returns NULL.  Same for
> > select min(day) from ...
> > select distinct(day) from... returns nothing at all.
> Using an explicit intermediate table does work:
> > create table foo_max as select day from partitioned_table where year=2013 and month=4;
 
> > select max(day) from foo_max; drop table foo_max;
> Several map-reduce jobs later, the correct answer is given.

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