Re: why copy tuple in the end of trigger when nothing changed in NEW OLD record variable

Tom Lane,
  er, your explanation is reasonable.
  But at least the comment  if (newtuple != tuple) /* modified by Trigger(s) */  {    .....  is likely to misdirect us.
  It took me a few hours to figure it out. :-(

======= 2008-06-10 23:43:00 In your letter you say:=======

>"billy" <billywq@163.com> writes:
>>     I think we can add some judgment conditions in function plpgsql_exec_trigger() to avoid this problem.
>
>I don't especially see the point of adding extra complexity here.
>AFAICS you are talking about avoiding one or two palloc/pfree
>cycles, which is surely down in the noise compared to the cost of
>calling a plpgsql trigger.
>
>            regards, tom lane
>
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　　　　　　　　billy
　　　　　　　　billywq@163.com
　　　　　　　　　　2008-06-11