Add pgtype GenericText and GenericBinary

Rows.Values uses this for unknown types.

pgtype/generic_binary.go

@@ -0,0 +1,29 @@
+package pgtype
+
+import (
+	"io"
+)
+
+// GenericBinary is a placeholder for binary format values that no other type exists
+// to handle.
+type GenericBinary Bytea
+
+func (dst *GenericBinary) Set(src interface{}) error {
+	return (*Bytea)(dst).Set(src)
+}
+
+func (dst *GenericBinary) Get() interface{} {
+	return (*Bytea)(dst).Get()
+}
+
+func (src *GenericBinary) AssignTo(dst interface{}) error {
+	return (*Bytea)(src).AssignTo(dst)
+}
+
+func (dst *GenericBinary) DecodeBinary(src []byte) error {
+	return (*Bytea)(dst).DecodeBinary(src)
+}
+
+func (src GenericBinary) EncodeBinary(w io.Writer) (bool, error) {
+	return (Bytea)(src).EncodeBinary(w)
+}