[teiid-issues] [JBoss JIRA] (TEIID-4619) left join returns wrong results

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-4619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13334788#comment-13334788 ] 

Steven Hawkins commented on TEIID-4619:
---------------------------------------

I don't see anything immediately wrong with the wrong result plan. 

The inner most join does have the predicate "convert(adm.patientid, string)=l.admissionid" which is concerning (if there is a collation issue), but seems to return the expected rows in the grouping plan.  In addition to these debug logs, can you provide the query plans post execution that show the node row counts?

> left join returns wrong results
> -------------------------------
>
>                 Key: TEIID-4619
>                 URL: https://issues.jboss.org/browse/TEIID-4619
>             Project: Teiid
>          Issue Type: Bug
>    Affects Versions: 9.0.4
>            Reporter: Bram Gadeyne
>            Assignee: Steven Hawkins
>            Priority: Critical
>         Attachments: correct_result.txt, enclosed_queryplan.txt, wrong_result.txt
>
>
> I have the following situation.
> I have a temporary table #tmp_admissions that contains 8047 rows. 
> In this first query there are 66290 results. However if I only look at the lines for infectionid 880 then there are only 16 lines.
> {code:sql}
> select l.infectionid, l.id as linkid, lc.linkcultureid, lc.responsibleculture, lc.culturealternative, cl.sampleinsertts, cl.specimennumber, 
> 				cl.culturenumber, cl.culturename, cl.quotation, ls.material, ls.sampletime,
> 				abr.culturenumber as abgram_culturenumber,abr.antibiogrampart, abr.resisttype, 
> 				lc.antibiogramculturenr,lc.antibiogramspecimennr,lc.antibiogramsampleinsertts
> 			from #tmp_admissions adm
> 			join cos2_links l on l.admissionid = cast(adm.patientid as string)
> 			join cos2_link_culture lc on lc.linkid = l.id
> 			left join cos2_lab_culture cl on cl.culturenumber = lc.culturenr and cl.specimennumber = lc.culturespecimennr and cl.sampleinsertts = lc.culturesampleinsertts
> 			left join cos2_lab_sample ls on ls.inserttime = cl.sampleinsertts and ls.specimennumber = cl.specimennumber
> 			left join cos2_antibiogramresistences abr on abr.specimennumber = cl.specimennumber and abr.culturenumber = cl.culturenumber and abr.sampleinsertts = cl.sampleinsertts
> {code}
> This query does almost the same but returns 30 rows (and is correct).
> {code:sql}
> select  l.infectionid, l.id as linkid, lc.linkcultureid, lc.responsibleculture, lc.culturealternative, cl.sampleinsertts, cl.specimennumber, 
> 				cl.culturenumber, cl.culturename, cl.quotation, ls.material, ls.sampletime,
> 				abr.culturenumber as abgram_culturenumber,abr.antibiogrampart, abr.resisttype, 
> 				lc.antibiogramculturenr,lc.antibiogramspecimennr,lc.antibiogramsampleinsertts
> from cos2_links l
> join cos2_link_culture lc on lc.linkid = l.id
> left join cos2_lab_culture cl on cl.culturenumber = lc.culturenr and cl.specimennumber = lc.culturespecimennr and cl.sampleinsertts = lc.culturesampleinsertts
> left join cos2_lab_sample ls on ls.inserttime = cl.sampleinsertts and ls.specimennumber = cl.specimennumber
> left join cos2_antibiogramresistences abr on abr.specimennumber = cl.specimennumber and abr.culturenumber = cl.culturenumber and abr.sampleinsertts = cl.sampleinsertts
> where l.infectionid = 880
> {code}
> cos2_link_culture contains 2 rows for this infectionid. The left join statements should result in 15 rows for both rows. However the left join results in the first query for the first row are null and to my understanding ignored. I'll attach the query plans for both queries.
> I should note that there is a one to many relation between infection and admission so therefore infectionid is for the same admission.
> Strangely enough if you enclode the first query in a group by query and count the rows it does indeed return 2 times 15 for the specific groups (see enclosed_queryplan.txt).



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