Unable to filter on an optional enum value

[mattdavpir]

Version: 4.6.0.1
Module: quill-jdbc-zio
Database: Postgres

Expected behavior

Filtering on an optional enum value should generate a query.

Actual behavior

There's a compilation error of "The Co-Product element was not a Case Class or Value Type. Value-level Co-Products are not supported. Please write a decoder for it's parent-type".

Steps to reproduce the behavior

https://scastie.scala-lang.org/j5t5LHW6Rnef3DP2cgaBew

Doing myTableQuery.filter(_.myTableType == lift(filter)) will compile, but using an optional filter and doing myTableQuery.filter(mt => lift(maybeFilter).forall(mt.myTableType == _)) will not. For an optional string query it would generate something like Quill Query: SELECT mt.id, mt.name, mt.my_table_type FROM my_table mt WHERE ? IS NULL OR mt.name = ?, so I think it should be doing something similar for an enum.

Workaround

@getquill/maintainers

[mattdavpir]

Actually I think as a workaround I can change that to be something more like the SQL generated by the forall statements, e.g. rather than myTableQuery.filter(mt => lift(maybeFilter).forall(mt.myTableType == _)) I can do something like myTableQuery.filter(mt => lift(maybeFilter.orNull) == null || mt.myTableType == lift(maybeFilter.orNull)).

edit - Although I also need to handle the null case in the encoder if I do this, I think.