Commit aa2387e

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Improve speed of timestamp/time/date output functions.

It seems that sprintf(), at least in glibc's version, is unreasonably slow compared to hand-rolled code for printing integers. Replacing most uses of sprintf() in the datetime.c output functions with special-purpose code turns out to give more than a 2X speedup in COPY of a table with a single timestamp column; which is pretty impressive considering all the other logic in that code path. David Rowley and Andres Freund, reviewed by Peter Geoghegan and myself

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src
- backend/utils/adt
  - datetime.c
  - numutils.c
- include/utils
  - builtins.h

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