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https://issues.apache.org/jira/browse/HIVE-5129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13747173#comment-13747173
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Navis commented on HIVE-5129:
-----------------------------
It seemed current distinct implementation has flaw.
{noformat}
select key, count(distinct key) + count(distinct value) from src tablesample
(10 ROWS) group by key;
100 1
val_100 1
165 1
val_165 1
238 1
val_238 1
255 1
val_255 1
27 1
val_27 1
278 1
val_278 1
311 1
val_311 1
409 1
val_409 1
86 1
val_86 1
98 1
val_98 1
{noformat}
this does not make sense.
> Multiple table insert fails on count(distinct)
> ----------------------------------------------
>
> Key: HIVE-5129
> URL: https://issues.apache.org/jira/browse/HIVE-5129
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: Vikram Dixit K
> Assignee: Vikram Dixit K
> Attachments: aggrTestMultiInsertData1.txt,
> aggrTestMultiInsertData.txt, aggrTestMultiInsert.q, HIVE-5129.1.patch.txt,
> HIVE-5129.2.WIP.patch.txt
>
>
> Hive fails with a class cast exception on queries of the form:
> {noformat}
> from studenttab10k
> insert overwrite table multi_insert_2_1
> select name, avg(age) as avgage
> group by name
> insert overwrite table multi_insert_2_2
> select name, age, sum(gpa) as sumgpa
> group by name, age
> insert overwrite table multi_insert_2_3
> select name, count(distinct age) as distage
> group by name;
> {noformat}
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