Set Error on correct field

command/encoding/json_test.go

@@ -410,10 +410,8 @@ func Test_MarshalExecuteQueryResponse(t *testing.T) {
 					},
 				},
 				{
-					Result: &command.ExecuteQueryResponse_E{
+					Result: &command.ExecuteQueryResponse_Error{
-						E: &command.ExecuteResult{
+						Error: "unique constraint failed",
-							Error: "unique constraint failed",
-						},
 					},
 				},
 				{

db/db.go

@@ -741,10 +741,8 @@ func (db *DB) Request(req *command.Request, xTime bool) ([]*command.ExecuteQuery
 		ro, err := db.StmtReadOnly(ss)
 		if err != nil {
 			eqResponse = append(eqResponse, &command.ExecuteQueryResponse{
-				Result: &command.ExecuteQueryResponse_Q{
+				Result: &command.ExecuteQueryResponse_Error{
-					Q: &command.QueryRows{
+					Error: err.Error(),
-						Error: err.Error(),
-					},
 				},
 			})
 			continue