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Etsuro Fujita 9e283fc85d postgres_fdw: Fix handling of a pending asynchronous request in postgresReScanForeignScan(). 
Commit 27e1f1456 failed to process a pending asynchronous request made
for a given ForeignScan node in postgresReScanForeignScan() (if any) in
cases where we would only reset the next_tuple counter in that function,
contradicting the assumption that there should be no pending
asynchronous requests that have been made for async-capable subplans for
the parent Append node after ReScan.  This led to an assert failure in
an assert-enabled build.  I think this would also lead to mis-rewinding
the cursor in that function in the case where we have already fetched
one batch for the ForeignScan node and the asynchronous request has been
made for the second batch, because even in that case we would just reset
the counter when called from that function, so we would fail to execute
MOVE BACKWARD ALL.

To fix, modify that function to process the asynchronous request before
restarting the scan.

While at it, add a comment to a function to match other places.

Per bug #17344 from Alexander Lakhin.  Back-patch to v14 where the
aforesaid commit came in.

Patch by me.  Test case by Alexander Lakhin, adjusted by me.  Reviewed
and tested by Alexander Lakhin and Dmitry Dolgov.

Discussion: https://postgr.es/m/17344-226b78b00de73a7e@postgresql.org
 		2022-01-27 16:15:00 +09:00
config Replace use of deprecated Python module distutils.sysconfig, take 2. 2022-01-25 18:52:44 -05:00
contrib postgres_fdw: Fix handling of a pending asynchronous request in postgresReScanForeignScan(). 2022-01-27 16:15:00 +09:00
doc Replace use of deprecated Python module distutils.sysconfig, take 2. 2022-01-25 18:52:44 -05:00
src On sparc64+ext4, suppress test failures from known WAL read failure. 2022-01-26 18:06:19 -08:00
.cirrus.yml ci: windows: run initdb with --no-sync. 2022-01-13 10:56:41 -08:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
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aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Replace use of deprecated Python module distutils.sysconfig, take 2. 2022-01-25 18:52:44 -05:00
configure.ac Make EXEC_BACKEND more convenient on Linux and FreeBSD. 2022-01-11 00:04:33 +13:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.