Re: Undocumented feature costs a lot of performance in COPY

> Tom Lane <tgl@sss.pgh.pa.us> writes:
> 
> > and indeed, only the first character is used by COPY OUT.  But COPY IN
> > is presently coded so that if multiple characters are mentioned in
> > USING DELIMITERS, any one of them will be taken as a field delimiter.
> > 
> > I would like to change the code to just "if (c == delim[0])",
> > which should buy back most of that 20% and make the behavior match the
> > documentation.  Question for the list: is this a bad change?  Is anyone
> > out there actually using this undocumented behavior?
> 
> Not I.
> 
> As an utter nitpick, the syntax should IMHO be USING DELIMITER (no S)
> if there is only one possible delimiter character.  But that *would*
> break lots of apps so I don't advocate it.  ;)

We could support keywords DELIMITER and DELIMITERS and only document the first
one.

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