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From "Chaoyu Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9534) incorrect result set for query that projects a windowed aggregate
Date Mon, 04 May 2015 02:39:06 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14526190#comment-14526190
] 

Chaoyu Tang commented on HIVE-9534:
-----------------------------------

I tried the tests (distinct with window function) in MySQL, PostgreSQL and Oracle with following
steps:
{code}
create table testwindow (col1 int, col2 int);
insert into testwindow values (1, 1);
insert into testwindow values (1, 2);
insert into testwindow values (1, 3);
insert into testwindow values (2, 1);
insert into testwindow values (2, 2);
insert into testwindow values (3, 3);
---
select avg(distinct col1) over() from testwindow;
{code}
MySQL: did not work and got the error msg: You have an error in your SQL syntax; check the
manual that corresponds to your MySQL server version for the right syntax to use near '()
from testwindow' at line 1

PostgreSQL: did not work and got the error msg: ERROR: DISTINCT is not implemented for window
functions Position: 8

Oracle: seemed work but I wonder if it is right, the average is right ( average of 1, 2, 3)
with 6 rows:
{code}
1  2
2  2
3  2
4  2
5  2
6  2
{code}

Hive only returns one row but with correct average: 2



> incorrect result set for query that projects a windowed aggregate
> -----------------------------------------------------------------
>
>                 Key: HIVE-9534
>                 URL: https://issues.apache.org/jira/browse/HIVE-9534
>             Project: Hive
>          Issue Type: Bug
>          Components: SQL
>            Reporter: N Campbell
>
> Result set returned by Hive has one row instead of 5
> {code}
> select avg(distinct tsint.csint) over () from tsint 
> create table  if not exists TSINT (RNUM int , CSINT smallint)
>  ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' LINES TERMINATED BY '\n' 
>  STORED AS TEXTFILE;
> 0|\N
> 1|-1
> 2|0
> 3|1
> 4|10
> {code}



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