Value.Bytes() return value directly

Previously the Value.Bytes() function was calling AppendBytes for it's
implementation. This causes uncessary memory to be allocated.

This changes the Bytes function to directly return the values instead of
performing an append to nil.

value.go

@@ -579,7 +579,26 @@ func (v Value) Column() int { return v.column() }
 // Bytes returns the binary representation of v.
 //
 // If v is the null value, an nil byte slice is returned.
-func (v Value) Bytes() []byte { return v.AppendBytes(nil) }
+func (v Value) Bytes() []byte {
+	switch v.Kind() {
+	case Boolean:
+		buf := [8]byte{}
+		binary.LittleEndian.PutUint32(buf[:4], v.uint32())
+		return buf[0:1]
+	case Int32, Float:
+		buf := [8]byte{}
+		binary.LittleEndian.PutUint32(buf[:4], v.uint32())
+		return buf[:4]
+	case Int64, Double:
+		buf := [8]byte{}
+		binary.LittleEndian.PutUint64(buf[:8], v.uint64())
+		return buf[:8]
+	case ByteArray, FixedLenByteArray, Int96:
+		return v.byteArray()
+	default:
+		return nil
+	}
+}
 
 // AppendBytes appends the binary representation of v to b.
 //