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From "Aihua Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10720) Pig using HCatLoader to access RCFile and perform join but get incorrect result.
Date Fri, 29 May 2015 22:28:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565570#comment-14565570
] 

Aihua Xu commented on HIVE-10720:
---------------------------------

I know revert is frustrating. :) but the patch didn't consider many cases. We need to revert
to unblock the customer issue since for the cases involving more than 1 table, the result
could be wrong.

> Pig using HCatLoader to access RCFile and perform join but get incorrect result.
> --------------------------------------------------------------------------------
>
>                 Key: HIVE-10720
>                 URL: https://issues.apache.org/jira/browse/HIVE-10720
>             Project: Hive
>          Issue Type: Bug
>          Components: HCatalog
>    Affects Versions: 1.3.0
>            Reporter: Aihua Xu
>            Assignee: Aihua Xu
>         Attachments: HIVE-10720.patch
>
>
> {noformat}
> Create table tbl1 (key string, value string) stored as rcfile;
> Create table tbl2 (key string, value string);
> insert into tbl1 values('1', 'value1');
> insert into tbl2 values('1', 'value2');
> {noformat}
> Pig script:
> {noformat}
> tbl1 = LOAD 'tbl1' USING org.apache.hive.hcatalog.pig.HCatLoader();
> tbl2 = LOAD 'tbl2' USING org.apache.hive.hcatalog.pig.HCatLoader();
> src_tbl1 = FILTER tbl1 BY (key == '1');
> prj_tbl1 = FOREACH src_tbl1 GENERATE
>            key as tbl1_key,
>            value as tbl1_value,
>            '333' as tbl1_v1;
>            
> src_tbl2 = FILTER tbl2 BY (key == '1');
> prj_tbl2 = FOREACH src_tbl2 GENERATE
>            key as tbl2_key,
>            value as tbl2_value;
>            
> result = JOIN prj_tbl1 BY (tbl1_key), prj_tbl2 BY (tbl2_key);
> prj_result = FOREACH result 
>       GENERATE  prj_tbl1::tbl1_key AS key1,
>                 prj_tbl1::tbl1_value AS value1,
>                 prj_tbl1::tbl1_v1 AS v1,
>                 prj_tbl2::tbl2_key AS key2,
>                 prj_tbl2::tbl2_value AS value2;
>                
> dump prj_result;
> {noformat}
> We could see different invalid results or even no result which should return.



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