[teiid-issues] [JBoss JIRA] (TEIID-5437) ORDER BY combined with UNION/UNION ALL fails on PostgreSQL

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-5437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615248#comment-13615248 ] 

Steven Hawkins commented on TEIID-5437:
---------------------------------------

This still occurs on master.  A missing detail is that it needs to be an ordered limit - x order by col1 limit 100

I should be able to address this shortly.

> ORDER BY combined with UNION/UNION ALL fails on PostgreSQL
> ----------------------------------------------------------
>
>                 Key: TEIID-5437
>                 URL: https://issues.jboss.org/browse/TEIID-5437
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>            Reporter: sameer P
>            Assignee: Steven Hawkins
>            Priority: Critical
>
> Combining union all and order by does not work when the query is pushed down to PostgreSQL.
> The following query with dsp and dwh as postgres datasources,
> {code:sql}
> select * from (
>     select b.i as col1, 'def' as col2 from dsp.test_ep_ds a
>     left join  dwh.test_ep_dwh b on b.str=a.str    
>     union all
>     select 2 as col1, 'abc' as col2
> )x order by col1
> {code}
> Fails with the below errors:
> {code:java}
> Error: TEIID30504 Remote org.teiid.core.TeiidProcessingException: TEIID30504 dsp_VDB_ID_1: 0 TEIID11008:TEIID11004 Error executing statement(s): [Prepared Values: [] SQL: SELECT g_0."str" AS c_0 FROM "public"."test_ep_ds" AS g_0 ORDER BY b."i" LIMIT 100]
> SQLState:  50000
> ErrorCode: 30504
> {code}
> Where as the following query works without any problem:
> {code:sql}
>  select b.i as col1, 'def' as col2 from dsp.test_ep_ds a
>     left join  dwh.test_ep_dwh b on b.str=a.str    
>     union all
>     select 2 as col1, 'abc' as col2
> {code}



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