Refactor COPY FROM to use format callback functions. This commit introduces a new CopyFromRoutine struct, which is a set of callback routines to read tuples in a specific format. It also makes COPY FROM with the existing formats (text, CSV, and binary) utilize these format callbacks.
This change is a preliminary step towards making the COPY FROM command extensible in terms of input formats. Similar to 2e4127b6d2d, this refactoring contributes to a performance improvement by reducing the number of "if" branches that need to be checked on a per-row basis when sending field representations in text or CSV mode. The performance benchmark results showed ~5% performance gain in text or CSV mode. Author: Sutou Kouhei <k...@clear-code.com> Reviewed-by: Masahiko Sawada <sawada.m...@gmail.com> Reviewed-by: Michael Paquier <mich...@paquier.xyz> Reviewed-by: Andres Freund <and...@anarazel.de> Reviewed-by: Tomas Vondra <tomas.von...@enterprisedb.com> Reviewed-by: Junwang Zhao <zhjw...@gmail.com> Discussion: https://postgr.es/m/20231204.153548.2126325458835528809....@clear-code.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/7717f63006935de00fafd000bff450280508adf1 Modified Files -------------- src/backend/commands/copyfrom.c | 192 ++++++++++--- src/backend/commands/copyfromparse.c | 446 +++++++++++++++++-------------- src/include/commands/copy.h | 2 - src/include/commands/copyapi.h | 50 +++- src/include/commands/copyfrom_internal.h | 11 + src/tools/pgindent/typedefs.list | 1 + 6 files changed, 459 insertions(+), 243 deletions(-)
