SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function uniqExact (children 1)
     ExpressionList (children 1)
      Identifier u
    Function uniqExact (children 1)
     ExpressionList (children 1)
      Identifier s
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_sparse_alter