Add new Case constraint which is more general than Table Expr
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The `Case` constraint is used for functions like `bool`, `case_`, `maybeTable`, `nullable`, all of which ultimately compile down to a PostgreSQL `CASE` statement. `Case` has two instances: an overlapping `Table Expr a => Case a` instance, and a `Case b => Case (a -> b)` instance, that allows expressions like `maybeTable id (+)` which would not have been possible for.
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The
Caseconstraint is used for functions likebool,case_,maybeTable,nullable, all of which ultimately compile down to a PostgreSQLCASEstatement.Casehas two instances: an overlappingTable Expr a => Case ainstance, and aCase b => Case (a -> b)instance, that allows expressions likemaybeTable id (+)which would not have been possible for.