SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier samples
   Function in (children 1)
    ExpressionList (children 2)
     Literal UInt64_1
     Function range (children 1)
      ExpressionList (children 1)
       Function modulo (children 1)
        ExpressionList (children 2)
         Function rand (children 1)
          ExpressionList
         Literal UInt64_1000
