Q045warning
Function access undeclared
A dialect resolved a function without saying whether it reads or writes data.
No reproduction. Every built-in dialect declares whether the functions it resolves read or modify data, so only a third-party dialect can raise it, and the playground runs the built-in dialects.
When it is reported
The function is treated as read-only, which is right for the built-ins involved. It is reported because a writing function treated this way would be sent to a read replica.
How to fix it
If you maintain the dialect, declare the function's data access.
See it in an example
In your terminal
$ sgl explain Q045
Look for FunctionDataAccessUndeclared in Seagull's source to see where it is reported.