From: | Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com> |
---|---|
To: | pgsql-hackers(at)lists(dot)postgresql(dot)org |
Subject: | Refactoring postgres_fdw/connection.c |
Date: | 2022-07-25 15:54:47 |
Message-ID: | 8cbc84da-148d-bfe3-dc58-c95e01b51d90@oss.nttdata.com |
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Lists: | pgsql-hackers |
Hi,
When reviewing the postgres_fdw parallel-abort patch [1], I found that
there are several duplicate codes in postgres_fdw/connection.c.
Which seems to make it harder to review the patch changing connection.c.
So I'd like to remove such duplicate codes and refactor the functions
in connection.c. I attached the following three patches.
There are two functions, pgfdw_get_result() and pgfdw_get_cleanup_result(),
to get a query result. They have almost the same code, call PQisBusy(),
WaitLatchOrSocket(), PQconsumeInput() and PQgetResult() in the loop,
but only pgfdw_get_cleanup_result() allows its callers to specify the timeout.
0001 patch transforms pgfdw_get_cleanup_result() to the common function
to get a query result and makes pgfdw_get_result() use it instead of
its own (duplicate) code. The patch also renames pgfdw_get_cleanup_result()
to pgfdw_get_result_timed().
pgfdw_xact_callback() and pgfdw_subxact_callback() have similar codes to
issue COMMIT or RELEASE SAVEPOINT commands. 0002 patch adds the common function,
pgfdw_exec_pre_commit(), for that purpose, and changes those functions
so that they use the common one.
pgfdw_finish_pre_commit_cleanup() and pgfdw_finish_pre_subcommit_cleanup()
have similar codes to wait for the results of COMMIT or RELEASE SAVEPOINT commands.
0003 patch adds the common function, pgfdw_finish_pre_commit(), for that purpose,
and replaces those functions with the common one.
That is, pgfdw_finish_pre_commit_cleanup() and pgfdw_finish_pre_subcommit_cleanup()
are no longer necessary and 0003 patch removes them.
[1] https://commitfest.postgresql.org/38/3392/
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION
Attachment | Content-Type | Size |
---|---|---|
v1-0001-Refactor-pgfdw_get_result-and-pgfdw_get_cleanup_resu.patch | text/plain | 6.7 KB |
v1-0002-Add-common-function-to-commit-xact-or-subxact-during.patch | text/plain | 6.8 KB |
v1-0003-Merge-pgfdw_finish_pre_commit_cleanup-and-pgfdw_fini.patch | text/plain | 5.0 KB |
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