pgsql: Optimize various aggregate deserialization functions - Mailing list pgsql-committers

From David Rowley
Subject pgsql: Optimize various aggregate deserialization functions
Date
Msg-id E1qphpq-000joR-Kq@gemulon.postgresql.org
Whole thread Raw
List pgsql-committers
Optimize various aggregate deserialization functions

The serialized representation of an internal aggregate state is a bytea
value.  In each deserial function, in order to "receive" the bytea value
we appended it onto a short-lived StringInfoData using
appendBinaryStringInfo.  This was a little wasteful as it meant having to
palloc memory, copy a (possibly long) series of bytes then later pfree
that memory.  Instead of going to this extra trouble, we can just fake up
a StringInfoData and point the data directly at the bytea's payload.  This
should help increase the performance of internal aggregate
deserialization.

Reviewed-by: Michael Paquier
Discussion: https://postgr.es/m/CAApHDvr=e-YOigriSHHm324a40HPqcUhSp6pWWgjz5WwegR=cQ@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/608fd198def5390c3490bfe903730207dfd8eeb4

Modified Files
--------------
src/backend/utils/adt/array_userfuncs.c | 24 ++++++++---------
src/backend/utils/adt/numeric.c         | 48 ++++++++++++++++-----------------
src/backend/utils/adt/varlena.c         | 12 ++++-----
3 files changed, 42 insertions(+), 42 deletions(-)


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