txid_current() forces a real xid

Right now, calling txid_current() causes a session to create a
non-virtual xid if not already assigned, so observing the xid creates
it, which seems kind of odd.  Is that intended?  Here is the C code:
TransactionIdGetTopTransactionId(void){    if (!TransactionIdIsValid(TopTransactionStateData.transactionId))
AssignTransactionId(&TopTransactionStateData);   return TopTransactionStateData.transactionId;}
 

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + It's impossible for everything to be true. +