Michael Paquier 011d60c435 Speed up uuid_out() by not relying on a StringInfo ...

Since the size of the string representation of an uuid is fixed, there
is no benefit in using a StringInfo.  This commit simplifies uuid_oud()
to not rely on a StringInfo, where avoiding the overhead of the string
manipulation makes the function substantially faster.

A COPY TO on a relation with one UUID attribute can show up to a 40%
speedup when the bottleneck is the COPY computation with uuid_out()
showing up at the top of the profiles (numbered measure here, Laurenz
has mentioned something closer to 20% faster runtimes), for example when
the data is fully in shared buffers or the OS cache.

Author: Laurenz Albe
Reviewed-by: Andres Freund, Michael Paquier
Description: https://postgr.es/m/679d5455cbbb0af667ccb753da51a475bae1eaed.camel@cybertec.at

2024-02-22 10:02:55 +09:00

..

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Build all Flex files standalone

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acl.c

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amutils.c

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arrayfuncs.c

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arraysubs.c

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cash.c

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char.c

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date.c

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datetime.c

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dbsize.c

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domains.c

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encode.c

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formatting.c

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hbafuncs.c

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inet_cidr_ntop.c

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inet_net_pton.c

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int8.c

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jsonfuncs.c

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jsonpath_exec.c

Add missing check_stack_depth() to some recursive functions

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jsonpath_gram.y

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jsonpath_scan.l

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jsonpath.c

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Makefile

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oid.c

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ruleutils.c

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selfuncs.c

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tid.c

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timestamp.c

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tsgistidx.c

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tsquery_cleanup.c

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tsvector.c

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uuid.c

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xid8funcs.c

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xid.c

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xml.c

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