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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HIVE-15369) Extend column pruner to account for residual filter expression in Join operator
Date Tue, 06 Dec 2016 15:49:58 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HIVE-15369 started by Jesus Camacho Rodriguez.
------------------------------------------------------
> Extend column pruner to account for residual filter expression in Join operator
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-15369
>                 URL: https://issues.apache.org/jira/browse/HIVE-15369
>             Project: Hive
>          Issue Type: Bug
>          Components: Logical Optimizer
>    Affects Versions: 2.2.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>
> Introduced by HIVE-15251.
> We need to extend ColumnPruner logic to take into account residual filter expressions
in Join operator. Otherwise, query will fail at execution time.
> Issue can be reproduced as follows:
> {code:sql}
> set hive.strict.checks.cartesian.product=false;
> CREATE TABLE test1 (key INT, value INT, col_1 STRING);
> INSERT INTO test1 VALUES (NULL, NULL, 'None'), (98, NULL, 'None'),
>     (99, 0, 'Alice'), (99, 2, 'Mat'), (100, 1, 'Bob'), (101, 2, 'Car');
> CREATE TABLE test2 (key INT, value INT, col_2 STRING);
> INSERT INTO test2 VALUES (102, 2, 'Del'), (103, 2, 'Ema'),
>     (104, 3, 'Fli'), (105, NULL, 'None');
> -- Complex condition and column projection
> EXPLAIN
> SELECT col_1, col_2
> FROM test1 LEFT OUTER JOIN test2
> ON (test1.value=test2.value
>       OR test1.key=test2.key);
> SELECT col_1, col_2
> FROM test1 LEFT OUTER JOIN test2
> ON (test1.value=test2.value
>       OR test1.key=test2.key);
> {code}



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