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https://issues.apache.org/jira/browse/HIVE-10720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565759#comment-14565759
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Aihua Xu commented on HIVE-10720:
---------------------------------
Unfortunately your patch is not right fix and it still produces incorrect
result. You can try the sample pig script I posted above. It will return the
result of
(1,value1,333,1,value1) while the correct result should be
(1,value1,333,1,value2). I believe you disabled the pig optimization in-house,
so it takes a different code path.
> 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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