SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier CounterID
    Identifier StartURL
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier unit
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier test.visits
     TableJoin
   ExpressionList (children 1)
    OrderByElement (children 1)
     Function tuple (children 1)
      ExpressionList (children 2)
       Identifier CounterID
       Identifier StartURL
   Literal UInt64_1000