[teiid-issues] [JBoss JIRA] (TEIID-5196) Osisoft Translator - Wrong data returned for some JOIN queries when integer and float columns are compared

[Ramesh Reddy (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-5196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511935#comment-13511935 ] 

Ramesh Reddy commented on TEIID-5196:
-------------------------------------

[~asmigala] What I see on this is inconsistent behavior by PI, executing the same query multiple times returning different results. Sometimes as specified above others with correct negative values. Not upcasting to double seems to return consistently, but [~shawkins] mentioned Integer to Float conversion is lossy conversion, which is not good that we pursue.

> Osisoft Translator - Wrong data returned for some JOIN queries when integer and float columns are compared
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: TEIID-5196
>                 URL: https://issues.jboss.org/browse/TEIID-5196
>             Project: Teiid
>          Issue Type: Bug
>          Components: JDBC Connector
>    Affects Versions: 8.12.x-6.4
>            Reporter: Andrej Šmigala
>            Assignee: Ramesh Reddy
>
> When using equality comparison between an integer and float columns in a WHERE or ON clause, Teiid pushes it to Osisoft PI with both columns cast as double.
> There seems to be a bug in Osisoft PI which causes the non-positive float values in the result for such a query to be returned as NULL (or not at all).
> E.g.
> {code:sql|title=Teiid query}
> SELECT BQT1.MediumA.IntNum, BQT1.MediumB.FloatNum 
> 	FROM BQT1.MediumA 
> 	FULL JOIN BQT1.MediumB 
> 		ON BQT1.MediumA.IntNum = BQT1.MediumB.FloatNum 
> 	WHERE 
> 		BQT1.MediumA.IntNum >= -10 
> 		AND BQT1.MediumA.IntNum < 5 
> 		AND (BQT1.MediumB.FloatNum >= -10 
> 		AND BQT1.MediumB.FloatNum < 5)
> {code}
> is translated to 
> {code:sql|title=Pushed Osisoft PI query}
> SELECT g_0.IntNum, g_1.FloatNum
> 	FROM dvqe..MediumA AS g_0, dvqe..MediumB AS g_1 
> 	WHERE 
> 		cast(g_0.IntNum AS Double) = cast(g_1.FloatNum AS Double)
> 		AND g_0.IntNum < 5 
> 		AND g_1.FloatNum >= -10.0
> 		AND g_1.FloatNum < 5.0
> 		AND g_0.IntNum >= -10
> {code}
> which seems to be correct, but returns the wrong result:
> ||IntNum||FloatNum||
> |1|1|
> |2|2|
> |3|3|
> |4|4|
> Note that the only the positive values are returned, even though the criteria match also negative values (which are present in the source table).
> If the cast to double in the source query is removed (or replaced with cast to single), the query returns the expected results.



--
This message was sent by Atlassian JIRA
(v7.5.0#75005)