From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | John Naylor <john(dot)naylor(at)2ndquadrant(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: benchmarking Flex practices |
Date: | 2020-01-13 20:12:52 |
Message-ID: | 10570.1578946372@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
John Naylor <john(dot)naylor(at)2ndquadrant(dot)com> writes:
> [ v11 patch ]
I pushed this with some small cosmetic adjustments.
One non-cosmetic adjustment I experimented with was to change
str_udeescape() to overwrite the source string in-place, since
we know that's modifiable storage and de-escaping can't make
the string longer. I reasoned that saving a palloc() might help
reduce the extra cost of UESCAPE processing. It didn't seem to
move the needle much though, so I didn't commit it that way.
A positive reason to keep the API as it stands is that if we
do something about the idea of allowing Unicode strings in
non-UTF8 backend encodings, that'd likely break the assumption
about how the string can't get longer.
I'm about to go off and look at the non-UTF8 idea, btw.
regards, tom lane
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