[teiid-issues] [JBoss JIRA] (TEIID-5290) NOW() function returns the same value for each call in BEGIN...END block

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-5290.
-----------------------------------
    Fix Version/s: 10.1.3
                   10.0.5
       Resolution: Done


Resolved by adding a new determinism level down to the instruction level.  This will keep the expected behavior by queries and in stored procedures - but does not fully match the behavior of other databases.  The docs were updated to note this behavior.

> NOW() function returns the same value for each call in BEGIN...END block
> ------------------------------------------------------------------------
>
>                 Key: TEIID-5290
>                 URL: https://issues.jboss.org/browse/TEIID-5290
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 10.1
>         Environment: teiid-10.1.0 on WildFly Full 11.0.0.Final (WildFly Core 3.0.8.Final)
>            Reporter: dalex dalex
>            Assignee: Steven Hawkins
>             Fix For: 10.2, 10.1.3, 10.0.5
>
>
> Run the following queries:
> {code:sql}
> BEGIN
> 	declare timestamp ts1 = select now();
> 	DECLARE integer c = 20000;
> 	WHILE (c > 0) 
> 		BEGIN
> 			c= c-1; 
> 		END
> 	declare timestamp ts2 = select now();
> 	select ts1, ts2;
> END ;;
> {code}
> and
> {code:sql}
> BEGIN
> 	DECLARE integer c = 20000;
> 	create local temporary table #tem(ts timestamp);
> 	WHILE (c > 0) 
> 		BEGIN
> 			INSERT INTO #tem VALUES((select NOW()));
> 			c= c-1; 
> 		END 
> 	select * from #tem;
> END ;;
> {code}
> NOW() function returns the same value for each call in BEGIN...END block and it doesn't matter if it is atomic or not.



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