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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5964) Hive missing a filter predicate causing wrong results joining tables after sort by
Date Fri, 06 Dec 2013 01:31:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13840799#comment-13840799
] 

Navis commented on HIVE-5964:
-----------------------------

I didn't checked exactly, but HIVE-4293 is seemingly fixing this issue.

trunk
{noformat}
STAGE PLANS:
  Stage: Stage-2
    Map Reduce
      Alias -> Map Operator Tree:
        t2:t1:test_tbl 
          TableScan
            alias: test_tbl
            Select Operator
              expressions:
                    expr: id
                    type: string
                    expr: name
                    type: string
              outputColumnNames: _col0, _col1
              Reduce Output Operator
                key expressions:
                      expr: _col0
                      type: string
                sort order: +
                tag: -1
                value expressions:
                      expr: _col0
                      type: string
                      expr: _col1
                      type: string
{noformat}

HIVE-4293
{noformat}
STAGE PLANS:
  Stage: Stage-2
    Map Reduce
      Alias -> Map Operator Tree:
        t2:t1:test_tbl 
          TableScan
            alias: test_tbl
            Filter Operator
              predicate:
                  expr: ((name = 'c') and (id = 'a'))
                  type: boolean
              Select Operator
                expressions:
                      expr: id
                      type: string
                      expr: name
                      type: string
                outputColumnNames: _col0, _col1
                Reduce Output Operator
                  key expressions:
                        expr: _col0
                        type: string
                  sort order: +
                  tag: -1
                  value expressions:
                        expr: _col0
                        type: string
                        expr: _col1
                        type: string
{noformat}

> Hive missing a filter predicate causing wrong results joining tables after sort by
> ----------------------------------------------------------------------------------
>
>                 Key: HIVE-5964
>                 URL: https://issues.apache.org/jira/browse/HIVE-5964
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.10.0, 0.11.0
>            Reporter: dima machlin
>            Priority: Blocker
>
> It seems like the optimization of predicate pushdown is failing under certain conditions
causing wrong results as a filter predicate appears to be completely disregarded by the query
processor for some reason.
> Here is the scenario (assuming "dual" table exists) :
> set hive.optimize.ppd=true;
> drop table if exists test_tbl ;
> create table test_tbl (id string,name string);
> insert into table test_tbl
> select 'a','b' from dual;
> test_tbl now contains :
> a b
> the following query :
> select t2.* 
> from
> (select id,name from (select id,name from test_tbl) t1 sort by id) t2
>  join test_tbl t3 on (t2.id=t3.id )
> where t2.name='c' and t3.id='a';
> returns :
> a b
> The filter :" t2.name='c' " is missing from the execution plan and obviously doesn't
apply.
> The filter "t3.id='a' " does appear in the plan and is being applied before the join.
> If the query changes a little bit like removing the sort by, removing the t1 sub-query
or disabling hive.optimize.ppd then the predicate appears.
> I'm able to reproduce the problem both in Hive 0.10 and Hive 0.11 although It seems to
work fine in Hive 0.7



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