Vlad Mihalcea ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiZTQ0NDkwMmM2... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-15766?atlOrigin=eyJpIjoiZTQ0ND... ) HHH-15766 ( https://hibernate.atlassian.net/browse/HHH-15766?atlOrigin=eyJpIjoiZTQ0ND... ) UNION query doesn't preserve the original semicolons, and so it fails on PostgreSQL ( https://hibernate.atlassian.net/browse/HHH-15766?atlOrigin=eyJpIjoiZTQ0ND... ) Issue Type: Bug Assignee: Unassigned Components: hibernate-core Created: 26/Nov/2022 06:56 AM Priority: Major Reporter: Vlad Mihalcea ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) If we execute a query like this one on PostgreSQL: List<String> topics = entityManager.createQuery(""" ( select c.name as name from Category c order by c.id ) union ( select t.name as name from Tag t order by t.id ) """, String.class) .getResultList(); The following exception is thrown: n.t.d.l.l.SLF4JQueryLoggingListener - Name:DATA_SOURCE_PROXY, Connection:6, Time:20, Success:False, Type:Prepared, Batch:False, QuerySize:1, BatchSize:0, Query:["select c1_0.name from category c1_0 order by c1_0.id union select t1_0.name from tag t1_0 order by t1_0.id"], Params:[()] o.h.e.j.s.SqlExceptionHelper - SQL Error: 0, SQLState: 42601 o.h.e.j.s.SqlExceptionHelper - ERROR: syntax error at or near "union" That’s because the generated SQL query does not preserve the semicolons: select c1_0.name from category c1_0 order by c1_0.id union select t1_0.name from tag t1_0 order by t1_0.id and this one fails in PostgreSQL. If the semicolons were preserved, then this SQL query would have worked just fine: (select c1_0.name from category c1_0 order by c1_0.id) union (select t1_0.name from tag t1_0 order by t1_0.id) ( https://hibernate.atlassian.net/browse/HHH-15766#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15766#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#100210- sha1:eab5823 )