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

[dalex dalex (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547995#comment-13547995 ] 

dalex dalex commented on TEIID-5290:
------------------------------------

> Have you found other pl/sql languages that behave differently?
{code:sql}
BEGIN
    DECLARE  @c integer = 20000;
    Declare @tem table (ts datetime);
    WHILE (@c > 0) 
        BEGIN
            INSERT INTO @tem VALUES((select getdate()));
            Set @c= @c-1; 
        END 
    select min(ts), max(ts) from @tem;
END ;;
{code}
on MSSQL the now() function is treated as a non-deterministic value showing the following results:
{code:noformat}
2018-03-19 17:18:42.547    2018-03-19 17:18:43.413
{code}

> 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
>            Priority: Blocker
>
> 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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