Improve select table with @Selection when using AliasName protocol

[Playrom]

Description

Hi

If I have an alias for a table, that table aliased cannot be used in select when using @selection , because conflicting signatures

I drop an example

struct Example {
    @Table
    struct Wallet {
        public let id: Int
        public let name: String
    }

    @Table
    struct Transfer {
        let id: Int
        let walletId: Int
    }

    enum WalletAlias: AliasName {
        static let aliasName: String = "wallet_alias"
    }

    static let transfers = Transfer
        .join(Wallet.as(WalletAlias.self).all, on: { transfersTable, sourceWallets in
            transfersTable.walletId.eq(sourceWallets.id)
        })

    @Selection
    public struct ExampleSelection1: Sendable {
        public let record: Example.Transfer
        public let sourceWallet: Example.Wallet
    }


    /// Initializer 'init(record:sourceWallet:)' requires the types 'TableAlias<Example.Wallet, Example.WalletAlias>.TableColumns.QueryValue' (aka 'TableAlias<Example.Wallet, Example.WalletAlias>') and 'Example.Wallet' be equivalent
    static let query1 = transfers
        .select { a, b in
            return ExampleSelection1.Columns(record: a, sourceWallet: b)
        }

    @Selection
    public struct ExampleSelection2: Sendable {
        public let record: Example.Transfer
        public let sourceWallet: Example.WalletAlias
    }

    /// Initializer 'init(record:sourceWallet:)' requires the types 'TableAlias<Example.Wallet, Example.WalletAlias>.TableColumns.QueryValue' (aka 'TableAlias<Example.Wallet, Example.WalletAlias>') and 'Example.WalletAlias' be equivalent
    static let query2 = transfers
        .select { a, b in
            return ExampleSelection2.Columns(record: a, sourceWallet: b)
        }
}

Only using this generic combination may result in a compilation, but it is a bit un-usable

@Selection
    public struct ExampleSelection1: Sendable {
        public let record: Example.Transfer
        public let sourceWallet: StructuredQueries.TableAlias<Example.Wallet, Example.WalletAlias>
    }


    /// Initializer 'init(record:sourceWallet:)' requires the types 'TableAlias<Example.Wallet, Example.WalletAlias>.TableColumns.QueryValue' (aka 'TableAlias<Example.Wallet, Example.WalletAlias>') and 'Example.Wallet' be equivalent
    static let query1 = transfers
        .select { a, b in
            return ExampleSelection1.Columns(record: a, sourceWallet: b)
        }

[stephencelis]

@Playrom You can use the table alias as a query representation to make this work:

 @Selection
 public struct ExampleSelection: Sendable {
   public let record: Example.Transfer
-  public let sourceWallet: TableAlias<Example.Wallet, Example.WalletAlias>
+  @Column(as: TableAlias<Example.Wallet, Example.WalletAlias>.self)
+  public let sourceWallet: Example.Wallet
 }

Since this isn't a bug in the library I'm going to convert to a discussion. We could definitely add docs for this, though!