[teiid-issues] [JBoss JIRA] (TEIID-4423) UPDATE command with non-pushdown functions leads to TEIID30253 error

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-4423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287695#comment-13287695 ] 

Steven Hawkins commented on TEIID-4423:
---------------------------------------

> That will force a single value for the uuid function / subquery.

Actually that is inconsistent that we currently work that way.  The whole expression should still be seen as non-deterministic.  

In general each database has different rules for handling non-deterministic expressions.  We are similar to H2, but it looks like you are expecting Postgres style handling such that uncorrelated subqueries are always treated as deterministic. 

> UPDATE command with non-pushdown functions leads to TEIID30253 error
> --------------------------------------------------------------------
>
>                 Key: TEIID-4423
>                 URL: https://issues.jboss.org/browse/TEIID-4423
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 8.12.x
>         Environment: teiid-8.12-Beta1 on Red Hat JBoss Enterprise Application Platform - Version 6.3.0.GA
> teiid-9.0.3 on WildFly Full 9.0.2.Final
>            Reporter: dalex dalex
>            Assignee: Steven Hawkins
>
> Running the following queries:
> {code:sql}
> update test.textagg_test_2 set id =(select uuid());;
> {code}
> or
> {code:sql}
> update test.textagg_test_2 set id =(select rand());;
> {code}
> leads to the following errors:
> {code}
> TEIID30253 Source UPDATE or DELETE command "UPDATE test.textagg_test_2 SET id = (SELECT uuid() LIMIT 2)" contains non-pushdown constructs and no compensating action can be taken as the table lacks a unique key or the source does not support equality predicates. 
> {code}
> and
> {code}
> TEIID30253 Source UPDATE or DELETE command "UPDATE test.textagg_test_2 SET id = convert((SELECT rand() LIMIT 2), string)" contains non-pushdown constructs and no compensating action can be taken as the table lacks a unique key or the source does not support equality predicates. 
> {code}
> though the following query:
> {code:sql}
> update test.textagg_test_2 set id =(select now());;
> {code}
> works without errors.



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