Re: Make COPY format extendable: Extract COPY TO format implementations

On Thu, Feb 01, 2024 at 10:57:58AM +0900, Michael Paquier wrote:
> And here are the results I get for text and binary (ms, average of 15
> queries after discarding the three highest and three lowest values):
>       test       | master |  v7  | v10
> -----------------+--------+------+------
>  from_bin_1col   | 1575   | 1546 | 1575
>  from_bin_10col  | 5364   | 5208 | 5230
>  from_text_1col  | 1690   | 1715 | 1684
>  from_text_10col | 4875   | 4793 | 4757
>  to_bin_1col     | 1717   | 1730 | 1731
>  to_bin_10col    | 7728   | 7707 | 7513
>  to_text_1col    | 1710   | 1730 | 1698
>  to_text_10col   | 5998   | 5960 | 5987

Here are some numbers from a second local machine:
      test       | master |  v7  | v10
-----------------+--------+------+------
 from_bin_1col   | 508    | 467  | 461
 from_bin_10col  | 2192   | 2083 | 2098
 from_text_1col  | 510    | 499  | 517
 from_text_10col | 1970   | 1678 | 1654
 to_bin_1col     | 575    | 577  | 573
 to_bin_10col    | 2680   | 2678 | 2722
 to_text_1col    | 516    | 506  | 527
 to_text_10col   | 2250   | 2245 | 2235

This is confirming a speedup with COPY FROM for both text and binary,
with more impact with a larger number of attributes.  That's harder to
conclude about COPY TO in both cases, but at least I'm not seeing any
regression even with some variance caused by what looks like noise.
We need more numbers from more people.  Sutou-san or Sawada-san, or
any volunteers?
--
Michael