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From "Miguel Lamy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-4700) physical plan in multiple Unions with jdbc storage with derived table without alias
Date Tue, 31 May 2016 18:40:12 GMT

     [ https://issues.apache.org/jira/browse/DRILL-4700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Miguel Lamy updated DRILL-4700:
-------------------------------
    Summary: physical plan in multiple Unions with jdbc storage with derived table without
alias  (was: physical plan in multiple Unions with jdbc storage with derived without alias)

> physical plan in multiple Unions with jdbc storage with derived table without alias
> -----------------------------------------------------------------------------------
>
>                 Key: DRILL-4700
>                 URL: https://issues.apache.org/jira/browse/DRILL-4700
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: SQL Parser, Storage - JDBC
>    Affects Versions: 1.6.0
>            Reporter: Miguel Lamy
>
> The problem occurs when there is more than one union in the query using jdbc storage.
> This query works:
> 0: jdbc:drill:zk=local> select  0 a from (values(1))
> . . . . . . . . . . . > union all
> . . . . . . . . . . . > select  1 a from (values(1))
> . . . . . . . . . . . > union all
> . . . . . . . . . . . > select  2 a from (values(1));
> +----+
> | a  |
> +----+
> | 0  |
> | 1  |
> | 2  |
> +----+
> This query using mysql storage or mssql storage doesn't work:
> 0: jdbc:drill:zk=local> select  0 as ChvOutTerc from ProcessarReceita procrec0
> . . . . . . . . . . . > union all
> . . . . . . . . . . . > select  1 as ChvOutTerc from ProcessarReceita procrec1
> . . . . . . . . . . . > union all
> . . . . . . . . . . . > select  2 as ChvOutTerc from ProcessarReceita procrec2;
> Error: DATA_READ ERROR: The JDBC storage plugin failed while trying setup the SQL query.
> sql SELECT *
> FROM (SELECT 0 AS "ChvOutTerc"
> FROM "dbo"."ProcessarReceita"
> UNION ALL
> SELECT 1 AS "ChvOutTerc"
> FROM "dbo"."ProcessarReceita")
> UNION ALL
> SELECT 2 AS "ChvOutTerc"
> FROM "dbo"."ProcessarReceita"
> plugin siag_enidh
> Fragment 0:0
> [Error Id: f3afa6ce-895c-4aa3-bfda-b769e4795ae1 on hefesto.siag.pt:31010] (state=,code=0)
> Changing the physical plan to include an alias on derived table and then executing that
physical plan works without problem:
> SELECT *
> FROM (SELECT 0 AS "ChvOutTerc"
> FROM "dbo"."ProcessarReceita"
> UNION ALL
> SELECT 1 AS "ChvOutTerc"
> FROM "dbo"."ProcessarReceita") mytable 
> UNION ALL
> SELECT 2 AS "ChvOutTerc"
> FROM "dbo"."ProcessarReceita"
> Also tested with 1.7.0-SNAPSHOT (20160531) with the same results.
> Results with just one union:
> 0: jdbc:drill:zk=local> select  0 as ChvOutTerc from ProcessarReceita procrec0
> . . . . . . . . . . . > union all
> . . . . . . . . . . . > select  1 as ChvOutTerc from ProcessarReceita procrec1 limit
3;
> +-------------+
> | ChvOutTerc  |
> +-------------+
> | 0           |
> | 0           |
> | 0           |
> +-------------+
> 3 rows selected (0.708 seconds)
> 0: jdbc:drill:zk=local> select  1 as ChvOutTerc from ProcessarReceita procrec1
> . . . . . . . . . . . > union all
> . . . . . . . . . . . > select  2 as ChvOutTerc from ProcessarReceita procrec2 limit
3;
> +-------------+
> | ChvOutTerc  |
> +-------------+
> | 1           |
> | 1           |
> | 1           |
> +-------------+
> 3 rows selected (0.449 seconds)



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