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Noah Misch d798ea750d Revive "snapshot too old" with wal_level=minimal and SET TABLESPACE. 
Given a permanent relation rewritten in the current transaction, the
old_snapshot_threshold mechanism assumed the relation had never been
subject to early pruning.  Hence, a query could fail to report "snapshot
too old" when the rewrite followed an early truncation.  ALTER TABLE SET
TABLESPACE is probably the only rewrite mechanism capable of exposing
this bug.  REINDEX sets indcheckxmin, avoiding the problem.  CLUSTER has
zeroed page LSNs since before old_snapshot_threshold existed, so
old_snapshot_threshold has never cooperated with it.  ALTER TABLE
... SET DATA TYPE makes the table look empty to every past snapshot,
which is strictly worse.  Back-patch to v13, where commit
c6b92041d3 broke this.

Kyotaro Horiguchi and Noah Misch

Discussion: https://postgr.es/m/20210113.160705.2225256954956139776.horikyota.ntt@gmail.com
2021-01-30 00:13:58 -08:00
..
access Prevent excess SimpleLruTruncate() deletion. 2021-01-16 12:21:38 -08:00
bootstrap Update copyrights for 2020 2020-01-01 12:21:45 -05:00
catalog Prevent drop of tablespaces used by partitioned relations 2021-01-14 15:32:14 -03:00
commands Rename SLRU structures and associated LWLocks. 2020-05-15 14:28:25 -04:00
common Move connect.h from fe_utils to src/include/common. 2020-08-10 09:22:58 -07:00
datatype Update copyrights for 2020 2020-01-01 12:21:45 -05:00
executor In INSERT/UPDATE, use the table's real tuple descriptor as target. 2020-11-08 13:08:36 -05:00
fe_utils Move connect.h from fe_utils to src/include/common. 2020-08-10 09:22:58 -07:00
foreign Update copyrights for 2020 2020-01-01 12:21:45 -05:00
jit llvmjit: Work around bug in LLVM 3.9 causing crashes after 72559438f9. 2020-10-15 18:17:00 -07:00
lib Initial pgindent and pgperltidy run for v13. 2020-05-14 13:06:50 -04:00
libpq Fix assorted issues in backend's GSSAPI encryption support. 2020-12-28 17:44:17 -05:00
mb Allow Unicode escapes in any server encoding, not only UTF-8. 2020-03-06 14:17:43 -05:00
nodes Ensure that expandTableLikeClause() re-examines the same table. 2020-12-01 14:02:27 -05:00
optimizer Fix pull_varnos' miscomputation of relids set for a PlaceHolderVar. 2021-01-21 15:37:23 -05:00
parser Calculate extraUpdatedCols in query rewriter, not parser. 2020-10-28 13:47:02 -04:00
partitioning Fix hash partition pruning with asymmetric partition sets. 2021-01-28 13:41:55 -05:00
port Choose ppc compare_exchange constant path for more operand values. 2020-10-11 21:31:40 -07:00
portability Update copyrights for 2020 2020-01-01 12:21:45 -05:00
postmaster Fix race condition between shutdown and unstarted background workers. 2020-12-24 17:00:43 -05:00
regex Assume that we have <wchar.h>. 2020-02-21 14:30:47 -05:00
replication Fix bogus cache-invalidation logic in logical replication worker. 2020-09-16 12:07:31 -04:00
rewrite Calculate extraUpdatedCols in query rewriter, not parser. 2020-10-28 13:47:02 -04:00
snowball Update copyrights for 2020 2020-01-01 12:21:45 -05:00
statistics Initial pgindent and pgperltidy run for v13. 2020-05-14 13:06:50 -04:00
storage Fix CREATE INDEX CONCURRENTLY for simultaneous prepared transactions. 2021-01-30 00:00:42 -08:00
tcop Fix bogus completion tag usage in walsender 2020-09-16 21:16:25 -03:00
tsearch Replace TS_execute's TS_EXEC_CALC_NOT flag with TS_EXEC_SKIP_NOT. 2020-07-24 15:43:56 -04:00
utils Revive "snapshot too old" with wal_level=minimal and SET TABLESPACE. 2021-01-30 00:13:58 -08:00
.gitignore Refactor dlopen() support 2018-09-06 11:33:04 +02:00
c.h Enable Unix-domain sockets support on Windows 2020-03-28 15:01:01 +01:00
fmgr.h Fix minor violations of FunctionCallInvoke usage protocol. 2020-04-21 14:23:53 -04:00
funcapi.h Avoid holding a directory FD open across assorted SRF calls. 2020-03-16 21:05:52 -04:00
getaddrinfo.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
getopt_long.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
Makefile Get rid of jsonpath_gram.h and jsonpath_scanner.h 2019-03-20 11:13:34 +03:00
miscadmin.h Add hash_mem_multiplier GUC. 2020-07-29 14:14:57 -07:00
pg_config.h.in Enable Unix-domain sockets support on Windows 2020-03-28 15:01:01 +01:00
pg_config_ext.h.in Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
pg_config_manual.h Remove ACLDEBUG #define and associated code. 2020-04-23 15:38:04 -04:00
pg_getopt.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pg_trace.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pgstat.h Mop-up for wait event naming issues. 2020-05-16 21:00:11 -04:00
pgtar.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pgtime.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
port.h Initial pgindent and pgperltidy run for v13. 2020-05-14 13:06:50 -04:00
postgres.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
postgres_ext.h Phase 2 of pgindent updates. 2017-06-21 15:19:25 -04:00
postgres_fe.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
rusagestub.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
windowapi.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00