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Andrew Gierth d2ecc27c37 Set scan direction appropriately for SubPlans (bug #15336) 
When executing a SubPlan in an expression, the EState's direction
field was left alone, resulting in an attempt to execute the subplan
backwards if it was encountered during a backwards scan of a cursor.
Also, though much less likely, it was possible to reach the execution
of an InitPlan while in backwards-scan state.

Repair by saving/restoring estate->es_direction and forcing forward
scan mode in the relevant places.

Backpatch all the way, since this has been broken since 8.3 (prior to
commit c7ff7663e, SubPlans had their own EStates rather than sharing
the parent plan's, so there was no confusion over scan direction).

Per bug #15336 reported by Vladimir Baranoff; analysis and patch by
me, review by Tom Lane.

Discussion: https://postgr.es/m/153449812167.1304.1741624125628126322@wrigleys.postgresql.org
2018-08-17 16:20:04 +01:00
..
backend Set scan direction appropriately for SubPlans (bug #15336) 2018-08-17 16:20:04 +01:00
bin pg_upgrade: issue helpful error message for use on standbys 2018-08-17 10:25:48 -04:00
common Enlarge find_other_exec's meager fgets buffer 2018-04-19 10:45:15 -03:00
include Stamp 9.5.14. 2018-08-06 16:09:28 -04:00
interfaces Clean up assorted misuses of snprintf()'s result value. 2018-08-15 16:29:32 -04:00
makefiles Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:31 -04:00
pl Translation updates 2018-08-06 19:35:42 +02:00
port Make snprintf.c follow the C99 standard for snprintf's result value. 2018-08-15 17:25:23 -04:00
template AIX: Test the -qlonglong option before use. 2015-07-17 03:01:29 -04:00
test Set scan direction appropriately for SubPlans (bug #15336) 2018-08-17 16:20:04 +01:00
timezone Update time zone data files to tzdata release 2018e. 2018-05-09 13:55:54 -04:00
tools pgtest: run clean, build, and check stages separately 2018-07-28 15:34:06 -04:00
tutorial Remove no-longer-required function declarations. 2015-05-24 12:20:23 -04:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
bcc32.mak Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
DEVELOPERS Replace a couple of references to files that no longer exist in the source 2009-05-04 08:08:47 +00:00
Makefile Install TAP test infrastructure so it's available for extension testing. 2016-09-23 15:50:00 -04:00
Makefile.global.in Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:31 -04:00
Makefile.shlib Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:31 -04:00
nls-global.mk nls-global.mk: search build dir for source files, too 2016-06-07 18:55:18 -04:00
win32.mak Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00