SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function generate_series (children 1)
       ExpressionList (children 3)
        Literal UInt64_0
        Literal UInt64_1000
        Literal UInt64_2
