InsertQuery   (children 3)
 Identifier parallel_replicas_backup
 ExpressionList (children 4)
  Identifier d
  Identifier x
  Identifier u
  Identifier s
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 4)
     Identifier d
     Identifier x
     Identifier u
     Identifier s
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier parallel_replicas