I'm sorry but I can not give you the data because it is medical data. I tried to reproduce this with less joins but then everything seems to work out fine.

Do you have any idea what might have caused this?

I now also used a temp table joined with 2 tables and then a where clause that has an exists condition with and without a BITAND function call.

usage of BITAND function in exists statement results in duplicate rows ---------------------------------------------------------------------- Key: TEIID-3511 URL: https://issues.jboss.org/browse/TEIID-3511 Project: Teiid Issue Type: Bug Affects Versions: 8.9.1 Reporter: Bram Gadeyne Assignee: Steven Hawkins Fix For: 8.12 Attachments: debugplan_bitand.txt, debugplan_bitand_correct.txt, debugplan_nobitand.txt, debugplan_nobitand_correct.txt I've added the debug plan for the query without the BITAND function and with the BITAND function as an attachment. The version without the BITAND function returns 438 rows and the version with BITAND function returns 833 rows. I can see however that rows are duplicated in this second result. I've checked this by executing the version with BITAND statement with select *.