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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-4561) Column stats : LOW_VALUE (or HIGH_VALUE) will always be 0.0000 ,if all the column values larger than 0.0 (or if all column values smaller than 0.0)
Date Sat, 28 Sep 2013 05:19:02 GMT

     [ https://issues.apache.org/jira/browse/HIVE-4561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Chauhan reassigned HIVE-4561:
--------------------------------------

    Assignee: Ashutosh Chauhan  (was: Zhuoluo (Clark) Yang)
    
> Column stats :  LOW_VALUE (or HIGH_VALUE) will always be 0.0000 ,if all the column values
larger than 0.0 (or if all column values smaller than 0.0)
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-4561
>                 URL: https://issues.apache.org/jira/browse/HIVE-4561
>             Project: Hive
>          Issue Type: Bug
>          Components: Statistics
>    Affects Versions: 0.12.0
>            Reporter: caofangkun
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-4561.1.patch, HIVE-4561.2.patch, HIVE-4561.3.patch
>
>
> if all column values larger than 0.0  DOUBLE_LOW_VALUE always will be 0.0 
> or  if all column values less than 0.0,  DOUBLE_HIGH_VALUE will always be 
> hive (default)> create table src_test (price double);
> hive (default)> load data local inpath './test.txt' into table src_test;
> hive (default)> select * from src_test;
> OK
> 1.0
> 2.0
> 3.0
> Time taken: 0.313 seconds, Fetched: 3 row(s)
> hive (default)> analyze table src_test compute statistics for columns price;
> mysql> select * from TAB_COL_STATS \G;
>                  CS_ID: 16
>                DB_NAME: default
>             TABLE_NAME: src_test
>            COLUMN_NAME: price
>            COLUMN_TYPE: double
>                 TBL_ID: 2586
>         LONG_LOW_VALUE: 0
>        LONG_HIGH_VALUE: 0
>       DOUBLE_LOW_VALUE: 0.0000   # Wrong Result ! Expected is 1.0000
>      DOUBLE_HIGH_VALUE: 3.0000
>  BIG_DECIMAL_LOW_VALUE: NULL
> BIG_DECIMAL_HIGH_VALUE: NULL
>              NUM_NULLS: 0
>          NUM_DISTINCTS: 1
>            AVG_COL_LEN: 0.0000
>            MAX_COL_LEN: 0
>              NUM_TRUES: 0
>             NUM_FALSES: 0
>          LAST_ANALYZED: 1368596151
> 2 rows in set (0.00 sec)

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