initial hasql support

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

hooks/sql/cluster.go

@@ -26,17 +26,6 @@ func newSQLRowError() *sql.Row {
 	return row
 }
 
-func newSQLRowsError() *sql.Rows {
-	rows := &sql.Rows{}
-	t := reflect.TypeOf(rows).Elem()
-	field, _ := t.FieldByName("lasterr")
-	rowPtr := unsafe.Pointer(rows)
-	errFieldPtr := unsafe.Pointer(uintptr(rowPtr) + field.Offset)
-	errPtr := (*error)(errFieldPtr)
-	*errPtr = errNoAliveNodes
-	return rows
-}
-
 type ClusterQuerier interface {
 	Querier
 	WaitForNodes(ctx context.Context, criterion ...hasql.NodeStateCriterion) error