Christian Beikov ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-15517 ( https://hibernate.atlassian.net/browse/HHH-15517?atlOrigin=eyJpIjoiMDE5MT... ) Re: "insert from select" With hibernate.default_schema Configured Doesn't Work With Hibernate 6 ( https://hibernate.atlassian.net/browse/HHH-15517?atlOrigin=eyJpIjoiMDE5MT... ) Ok, the problem is that you are providing an expression for the id attribute in the insert, so we wouldn’t have to use a temporary table acrobatics, but we currently fail to detect this early enough. I’ll look into optimizing this. ( https://hibernate.atlassian.net/browse/HHH-15517#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15517#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100207- sha1:7afd384 )