address comments

Author: jackysp

server/conn_stmt.go

@@ -249,9 +249,8 @@ func parseStmtArgs(args []interface{}, boundParams [][]byte, nullBitmap, paramTy
 			args[i] = nil
 			continue
 		}
-		if boundParamLength := len(boundParams[i]); boundParamLength != 0 {
-			// Trim out the last ending byte.
-			args[i] = boundParams[i][:boundParamLength-1]
+		if boundParams[i] != nil {
+			args[i] = boundParams[i]
 			continue
 		}
 
@@ -510,8 +509,7 @@ func (cc *clientConn) handleStmtSendLongData(data []byte) (err error) {
 	}
 
 	paramID := int(binary.LittleEndian.Uint16(data[4:6]))
-	// Append an extra 0 to the end to distinguish no data and no parameter.
-	return stmt.AppendParam(paramID, append(data[6:], 0))
+	return stmt.AppendParam(paramID, data[6:])
 }
 
 func (cc *clientConn) handleStmtReset(data []byte) (err error) {

server/driver_tidb.go

@@ -85,7 +85,12 @@ func (ts *TiDBStatement) AppendParam(paramID int, data []byte) error {
 	if paramID >= len(ts.boundParams) {
 		return mysql.NewErr(mysql.ErrWrongArguments, "stmt_send_longdata")
 	}
-	ts.boundParams[paramID] = append(ts.boundParams[paramID], data...)
+	// If len(data) is 0, append an empty byte slice to the end to distinguish no data and no parameter.
+	if len(data) == 0 {
+		ts.boundParams[paramID] = []byte{}
+	} else {
+		ts.boundParams[paramID] = append(ts.boundParams[paramID], data...)
+	}
 	return nil
 }