Søren Jepsen ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ca1c89... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiMzQyZDA2NWI5... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-15622?atlOrigin=eyJpIjoiMzQyZD... ) HHH-15622 ( https://hibernate.atlassian.net/browse/HHH-15622?atlOrigin=eyJpIjoiMzQyZD... ) Query bug in @NamedEntityGraph when doing Eager loading of @OneToOne mappings in Single Table inheritance ( https://hibernate.atlassian.net/browse/HHH-15622?atlOrigin=eyJpIjoiMzQyZD... ) Change By: Søren Jepsen ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ca1c89... ) There appears to be a bug in [*@NamedEntityGraph*|https://github.com/entitygraph] when trying to eager load a [*@OnetoOne*|https://github.com/OnetoOne] mapping with [*@Mapsid*|https://github.com/mapsid] in a Single Table inheritance setup. When doing eager loading, I get the following error: {{Caused by: org.postgresql.util.PSQLException: ERROR: operator does not exist: uuid = character varying Hint: No operator matches the given name and argument types. You might need to add explicit type casts.}} Generated sql: 'select p1_0.id,d1_0.parent_id,d1_0.dtype,d1_0.organization_id,d1_0.module_width,p1_0.organization_id from physical_aspect p1_0 left join physical_aspect_definition d1_0 on _p1_0.id=d1_0.dtype_ where p1_0.organization_id=?' Seems like trying to compare id=dtype (discriminator column). The bug appears in Hibernate 6.1. 3 4 and previous versions og of 6. The [@NamedEntityGraph|https://github.com/entitygraph] feature is tested working with Hibernate 5.6.11 I've included a testcase for both 6.1.4 and 5.6.11 ([https://github.com/s-jepsen/hibernate-test-case-templates|https://github....]) ( https://hibernate.atlassian.net/browse/HHH-15622#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15622#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#100209- sha1:392b984 )