Import to pgx main repo in pgtype subdir

pgtype/unknown.go

@@ -0,0 +1,44 @@
+package pgtype
+
+import "database/sql/driver"
+
+// Unknown represents the PostgreSQL unknown type. It is either a string literal
+// or NULL. It is used when PostgreSQL does not know the type of a value. In
+// general, this will only be used in pgx when selecting a null value without
+// type information. e.g. SELECT NULL;
+type Unknown struct {
+	String string
+	Valid  bool
+}
+
+func (dst *Unknown) Set(src interface{}) error {
+	return (*Text)(dst).Set(src)
+}
+
+func (dst Unknown) Get() interface{} {
+	return (Text)(dst).Get()
+}
+
+// AssignTo assigns from src to dst. Note that as Unknown is not a general number
+// type AssignTo does not do automatic type conversion as other number types do.
+func (src *Unknown) AssignTo(dst interface{}) error {
+	return (*Text)(src).AssignTo(dst)
+}
+
+func (dst *Unknown) DecodeText(ci *ConnInfo, src []byte) error {
+	return (*Text)(dst).DecodeText(ci, src)
+}
+
+func (dst *Unknown) DecodeBinary(ci *ConnInfo, src []byte) error {
+	return (*Text)(dst).DecodeBinary(ci, src)
+}
+
+// Scan implements the database/sql Scanner interface.
+func (dst *Unknown) Scan(src interface{}) error {
+	return (*Text)(dst).Scan(src)
+}
+
+// Value implements the database/sql/driver Valuer interface.
+func (src Unknown) Value() (driver.Value, error) {
+	return (Text)(src).Value()
+}