Re: Bulkloading using COPY - ignore duplicates?

Justin Clift writes:
 > Lee Kindness wrote:
 > >  WITH ON_DUPLICATE = CONTINUE|TERMINATE (or similar)
 > I would suggest :
 > WITH ON_DUPLICATE = IGNORE|TERMINATE
 > purely for easier understanding, given there is no present standard nor
 > other databases' syntax to conform to.

Personally I don't see the need, and think that 'COPY FROM' could well
just go with the new semantics...

Onto an implementation issue - _bt_check_unique() returns a
TransactionId, my plans were to return NullTransactionId on a
duplicate key but naturally this is used in the success
scenario. Looking in backend/transam/transam.c I see:

 TransactionId NullTransactionId = (TransactionId) 0;
 TransactionId AmiTransactionId = (TransactionId) 512;
 TransactionId FirstTransactionId = (TransactionId) 514;

From this I'd gather <514 can be used as magic-values/constants, So
would I be safe doing:

 TransactionId XXXXTransactionId = (TransactionId) 1;

and return XXXXTransactionId from _bt_check_unique() back to
_bt_do_insert()? Naturally XXXX is something meaningful. I presume all
I need to know is if 'xwait' in _bt_check_unique() is ever '1'...

Thanks,

--
 Lee Kindness, Senior Software Engineer
 Concept Systems Limited.