In this blog post, let’s learn about the error message “293 IS [NOT] NULL predicate may be used only with simple columns.” in Hydra and the description of the error.
Error Message
293 IS [NOT] NULL predicate may be used only with simple columns.
Error Details
The current LOCK TABLE statement cannot be executed because you have already locked the same table using a different mode (EXCLUSIVE or SHARE). To change the lock mode, arrange to unlock the table before you lock it again.