SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function sumArray (children 1)
     ExpressionList (children 1)
      Identifier arr.null
    Function sum (children 1)
     ExpressionList (children 1)
      Identifier arr.size0
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier subcolumns