SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function minus (children 1)
     ExpressionList (children 2)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function sum (children 1)
            ExpressionList (children 1)
             Function cityHash64 (children 1)
              ExpressionList (children 1)
               Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function file (children 1)
              ExpressionList (children 2)
               Identifier a.csv
               Identifier LineAsString
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function sum (children 1)
            ExpressionList (children 1)
             Function cityHash64 (children 1)
              ExpressionList (children 1)
               Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function file (children 1)
              ExpressionList (children 2)
               Identifier b.csv
               Identifier LineAsString
