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:

        TransactionId
        GetTopTransactionId(void)
        {
            if (!TransactionIdIsValid(TopTransactionStateData.transactionId))
                AssignTransactionId(&TopTransactionStateData);
            return TopTransactionStateData.transactionId;
        }

-- 
  Bruce Momjian  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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