Merge pull request #593 from erizocosmico/feature/rollback

sql: implement dummy ROLLBACK

Author: ajnavarro

engine_test.go

@@ -864,6 +864,10 @@ var queries = []struct {
 		"SHOW COLLATION WHERE `Default` = 'Yes'",
 		[]sql.Row{{"utf8_bin", "utf8mb4", int64(1), "Yes", "Yes", int64(1)}},
 	},
+	{
+		"ROLLBACK",
+		[]sql.Row{},
+	},
 }
 
 func TestQueries(t *testing.T) {

sql/parse/parse.go

@@ -145,6 +145,8 @@ func convert(ctx *sql.Context, stmt sqlparser.Statement, query string) (sql.Node
 		return convertSet(ctx, n)
 	case *sqlparser.Use:
 		return convertUse(n)
+	case *sqlparser.Rollback:
+		return plan.NewRollback(), nil
 	}
 }
 

sql/parse/parse_test.go

@@ -1007,6 +1007,7 @@ var fixtures = map[string]sql.Node{
 		),
 		plan.NewShowCollation(),
 	),
+	`ROLLBACK`: plan.NewRollback(),
 }
 
 func TestParse(t *testing.T) {

sql/plan/transaction.go

@@ -0,0 +1,35 @@
+package plan
+
+import "gopkg.in/src-d/go-mysql-server.v0/sql"
+
+// Rollback undoes the changes performed in a transaction.
+type Rollback struct{}
+
+// NewRollback creates a new Rollback node.
+func NewRollback() *Rollback { return new(Rollback) }
+
+// RowIter implements the sql.Node interface.
+func (*Rollback) RowIter(*sql.Context) (sql.RowIter, error) {
+	return sql.RowsToRowIter(), nil
+}
+
+func (*Rollback) String() string { return "ROLLBACK" }
+
+// TransformUp implements the sql.Node interface.
+func (r *Rollback) TransformUp(f sql.TransformNodeFunc) (sql.Node, error) {
+	return f(r)
+}
+
+// TransformExpressionsUp implements the sql.Node interface.
+func (r *Rollback) TransformExpressionsUp(f sql.TransformExprFunc) (sql.Node, error) {
+	return r, nil
+}
+
+// Resolved implements the sql.Node interface.
+func (*Rollback) Resolved() bool { return true }
+
+// Children implements the sql.Node interface.
+func (*Rollback) Children() []sql.Node { return nil }
+
+// Schema implements the sql.Node interface.
+func (*Rollback) Schema() sql.Schema { return nil }