[jira] [Created] (DRILL-4700) physical plan in multiple Unions with jdbc storage with derived without alias

["Miguel Lamy (JIRA)" <ji...@apache.org>]

Miguel Lamy created DRILL-4700:
----------------------------------

             Summary: physical plan in multiple Unions with jdbc storage with derived 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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