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Refactor COPY TO to use format callback functions.

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This commit introduces a new CopyToRoutine struct, which is a set of
callback routines to copy tuples in a specific format. It also makes
the existing formats (text, CSV, and binary) utilize these format
callbacks.

This change is a preliminary step towards making the COPY TO command
extensible in terms of output formats.

Additionally, 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 <kou@clear-code.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
Reviewed-by: Junwang Zhao <zhjwpku@gmail.com>
Discussion: https://postgr.es/m/20231204.153548.2126325458835528809.kou@clear-code.com
This commit is contained in:
Masahiko Sawada
2025-02-27 15:03:52 -08:00
parent 555960a0fb
commit 2e4127b6d2
3 changed files with 355 additions and 141 deletions
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src/tools/pgindent/typedefs.list
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@@ -512,6 +512,7 @@ CopyMultiInsertInfo
CopyOnErrorChoice
CopySource
CopyStmt
CopyToRoutine
CopyToState
CopyToStateData
Cost