[teiid-issues] [JBoss JIRA] (TEIID-3129) Limit is not added with multiple nulls in select on outer query to an inline view

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-3129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-3129.
-----------------------------------
    Fix Version/s: 8.9
       Resolution: Done


Updated the logic dealing with distinct optimization with another check in rule collapse source.

> Limit is not added with multiple nulls in select on outer query to an inline view
> ---------------------------------------------------------------------------------
>
>                 Key: TEIID-3129
>                 URL: https://issues.jboss.org/browse/TEIID-3129
>             Project: Teiid
>          Issue Type: Enhancement
>          Components: Query Engine
>    Affects Versions: 8.9
>            Reporter: Sanjeev Gour
>            Assignee: Steven Hawkins
>             Fix For: 8.9
>
>
> When a query does multiple null selects in the in the outer query to an inline view and you only have a DISTINCT constant selected from the view definition, a limit 1 is expected to be applied to the inline view query which does not happen. Here is the sample query-
> SELECT DISTINCT c1, null as c2, null as c3 FROM(
>     SELECT c1, c2 FROM (
>         SELECT 'const_col_1' as c1, ID as c2 FROM FIRST_SCHEMA.FIRST_TABLE
>         UNION ALL
>         SELECT 'const_col_2' as c1, ID as c2 FROM SECOND_SCHEMA.SECOND_TABLE
>     ) as v
> ) as v1
> The query will contain queries to the inline view without a limit like the following-
> SELECT 'const_col_1' FROM h2extended.TEST.FIRST_SCHEMA.FIRST_TABLE AS g_0 -------------------LIMIT 1 is not applied here
> Full query plan and the detail are capture in this discussion-
> https://developer.jboss.org/thread/248787



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