Re: Is it possible to set end-of-data marker for COPY statement.

On Tue, Sep  1, 2020 at 12:05:02PM -0400, Bruce Momjian wrote:
> > copy test from '/tmp/data' DELIMITER ',';
> > 
> > An end-of-copy marker corrupt error will be raised.
> > 
> > This requires users to escape the end-of-data marker manually in their data.
> > Why we don't have a mechanism to define other characters as end-of-data marker?
> > Or there are other ways to avoid escape the end-of-data in data?
> 
> This is the first I am hearing of this.  The problem is that the system
> can't decide if \. is escaping a delimiter, or the end-of-copy marker. 
> I think we need to just disable period as a delimiter.  I don't think
> there is enough demand to allow the end-of-data marker to be
> configurable.
> 
> Interestingly, you can use period as s delimiter if you are copying from
> a file that doesn't need an end-of-data marker and you never need to
> escape the delimiter, but that seems like too rare a use case to allow
> period to be supported as a delimiter.

I am sorry I mis-read this email.  The example uses _comma_ for the
delimiter, rather than period.  Let me reply again.  We already disallow
period for delimiters:

        COPY test TO '/u/postgres/tmp/x' WITH (DELIMITER '.');
        ERROR:  COPY delimiter cannot be "."

        COPY test TO STDOUT WITH (DELIMITER '.');
        ERROR:  COPY delimiter cannot be "."

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EnterpriseDB                             https://enterprisedb.com

  The usefulness of a cup is in its emptiness, Bruce Lee