Support generating pointers for nullable enum types (emit_pointers_for_null_types for enums)

[nderscore]

What do you want to change?

Currently, when a field is nullable and an enum, sqlc always generates a new type with a prefix Null. This Null___ type is a struct that wraps the enum's string alias type and adds a Valid boolean property to represent the NULL state.

sqlc has a setting called emit_pointers_for_null_types which replaces similar nullable wrapper types with pointers instead (NullString -> *string)

This feature request seeks to bring similar functionality to nullable enum fields. Instead of generating a Null___ type for a nullable enum field, it should be a represented by a pointer (NullFooEnum -> *FooEnum)

Questions

• If this feature were to be implemented, should it be enabled by the existing emit_pointers_for_null_types config setting? Or should it be a separate setting?

Other notes

I couldn't find an existing issue for this, but there is an open PR #3093 which seemed to be working towards the same goal.

What database engines need to be changed?

No response

What programming language backends need to be changed?

No response