Обсуждение: [COMMITTERS] pgsql: Cache datatype-output-function lookup info across calls ofconca

Cache datatype-output-function lookup info across calls of concat().

Testing indicates this can save a third to a half of the runtime
of the function.

Pavel Stehule, reviewed by Alexander Kuzmenkov

Discussion: https://postgr.es/m/CAFj8pRAT62pRgjoHbgTfJUc2uLmeQ4saUj+yVJAEZUiMwNCmdg@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/ed22fb8b0091deea23747310fa7609079a96cf82

Modified Files
--------------
src/backend/utils/adt/varlena.c | 54 ++++++++++++++++++++++++++++++++++-------
1 file changed, 45 insertions(+), 9 deletions(-)


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