SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 3)
    Identifier visitorId
    Identifier orderId
    Function groupUniqArray (children 1)
     ExpressionList (children 1)
      Identifier sessionId
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier sessions
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier orders
     TableJoin (children 1)
      Function and (children 1)
       ExpressionList (children 2)
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier sessions.visitorId
          Identifier orders.visitorId
        Function lessOrEquals (children 1)
         ExpressionList (children 2)
          Identifier sessions.date
          Identifier orders.date
   ExpressionList (children 2)
    Identifier visitorId
    Identifier orderId
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier visitorId
    OrderByElement (children 1)
     Identifier orderId
   Set