Kean Erickson ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiM2Y3ZWYxYzY0... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-14134?atlOrigin=eyJpIjoiM2Y3ZW... ) HHH-14134 ( https://hibernate.atlassian.net/browse/HHH-14134?atlOrigin=eyJpIjoiM2Y3ZW... ) Querying with "IS NOT EMPTY" jpql against a @OneToMany mappedBy collection is failing in mysql for Hibernate v. 5.4.11 and up ( https://hibernate.atlassian.net/browse/HHH-14134?atlOrigin=eyJpIjoiM2Y3ZW... ) Issue Type: Bug Affects Versions: 5.4.11 Assignee: Unassigned Attachments: MysqlEmptyTest.java, Stuff.java, Thing.java, setup.sql Components: hibernate-core Created: 31/Jul/2020 22:31 PM Priority: Minor Reporter: Kean Erickson ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Please see attached test files. In the attached files, A Stuff has multiple Things. Each of the Things has a parental reference to their Stuff. The test attempts to do an IS EMPTY check in JPQL against the stuff's @OneToMany mappedBy collection of things. This is the resulting error: Jul 31, 2020 10:21:33 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions WARNING: SQL Error: 1241, SQLState: 21000 Jul 31, 2020 10:21:33 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions SEVERE: Operand should contain 1 column(s) Tested against mysql Ver 14.14 Distrib 5.6.38, for Win64 (x86_64) ( https://hibernate.atlassian.net/browse/HHH-14134#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-14134#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#100140- sha1:33445dc )