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From "Jinfeng Ni (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2069) Star is not expanded correctly in the query with IN clause containing subquery
Date Mon, 26 Jan 2015 18:27:34 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292184#comment-14292184
] 

Jinfeng Ni commented on DRILL-2069:
-----------------------------------

Upgrade to critical, since it's incorrect result, and it represents one quite typical query
pattern.

> Star is not expanded correctly in the query with IN clause containing subquery
> ------------------------------------------------------------------------------
>
>                 Key: DRILL-2069
>                 URL: https://issues.apache.org/jira/browse/DRILL-2069
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 0.8.0
>            Reporter: Victoria Markman
>            Assignee: Jinfeng Ni
>            Priority: Critical
>
> t1.json
> {code}
> { "a1": "aa", "b1": 1 }
> { "a1": "bb", "b1": 2 }
> { "a1": "cc", "b1": 3 }
> {code}
> t2.json
> {code}
> { "a2": "aa", "b2": 1 }
> { "a2": "bb", "b2": 2 }
> { "a2": "xx", "b2": 10 }
> {code}
> Star is expanded incorrectly, we should get only columns from `t1.json`
> {code}
> 0: jdbc:drill:schema=dfs> select * from `t1.json` where a1 in (select a2 from `t2.json`);
> +------------+------------+------------+------------+
> |     a2     |     a1     |     b1     |    a10     |
> +------------+------------+------------+------------+
> | aa         | aa         | 1          | aa         |
> | bb         | bb         | 2          | bb         |
> +------------+------------+------------+------------+
> 2 rows selected (0.172 seconds)
> {code}
> explain plan
> {code}
> 00-01      Project(*=[$0])
> 00-02        Project(*=[$0])
> 00-03          HashJoin(condition=[=($1, $2)], joinType=[inner])
> 00-05            Project(*=[$0], a1=[$1])
> 00-07              Scan(groupscan=[EasyGroupScan [selectionRoot=/test/t1.json, numFiles=1,
columns=[`*`], files=[maprfs:/test/t1.json]]])
> 00-04            HashAgg(group=[{0}])
> 00-06              Scan(groupscan=[EasyGroupScan [selectionRoot=/test/t2.json, numFiles=1,
columns=[`a2`], files=[maprfs:/test/t2.json]]])
> {code}
> Workaround - specify columns explicitly
> {code}
> 0: jdbc:drill:schema=dfs> select t1.a1, t1.a1 from `t1.json` t1 where t1.a1 in (select
t2.a2 from `t2.json` t2);
> +------------+------------+
> |     a1     |    a10     |
> +------------+------------+
> | aa         | aa         |
> | bb         | bb         |
> +------------+------------+
> 2 rows selected (0.24 seconds)
> {code}
> Note to myself: include cases like below during verification:
> {code}
> 0: jdbc:drill:schema=dfs> select * from `t1.json` t1 where (a1, b1) in (select a2,
b2 from `t2.json`);
> +------------+------------+------------+------------+------------+------------+
> |     a2     |     b2     |     a1     |     b1     |    a10     |    b10     |
> +------------+------------+------------+------------+------------+------------+
> | aa         | 1          | aa         | 1          | aa         | 1          |
> | bb         | 2          | bb         | 2          | bb         | 2          |
> +------------+------------+------------+------------+------------+------------+
> 2 rows selected (0.323 seconds)
> 0: jdbc:drill:schema=dfs> select * from `t1.json` t1 where (a1, b1) in (select * from
`t2.json`);
> Query failed: SqlValidatorException: Values passed to IN operator must have compatible
types
> Error: exception while executing query: Failure while executing query. (state=,code=0)
> {code}



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