postgresql/contrib/test_decoding
Amit Kapila 05555f7aaa Stop demanding that top xact must be seen before subxact in decoding.
Manifested as

ERROR:  subtransaction logged without previous top-level txn record

this check forbids legit behaviours like
 - First xl_xact_assignment record is beyond reading, i.e. earlier
   restart_lsn.
 - After restart_lsn there is some change of a subxact.
 - After that, there is second xl_xact_assignment (for another subxact)
   revealing the relationship between top and first subxact.

Such a transaction won't be streamed anyway because we hadn't seen it in
full.  Saying for sure whether xact of some record encountered after
the snapshot was deserialized can be streamed or not requires to know
whether it wrote something before deserialization point --if yes, it
hasn't been seen in full and can't be decoded. Snapshot doesn't have such
info, so there is no easy way to relax the check.

Reported-by: Hsu, John
Diagnosed-by: Arseny Sher
Author: Arseny Sher, Amit Kapila
Reviewed-by: Amit Kapila, Dilip Kumar
Backpatch-through: 9.5
Discussion: https://postgr.es/m/AB5978B2-1772-4FEE-A245-74C91704ECB0@amazon.com
2020-02-19 08:59:18 +05:30
..
expected Stop demanding that top xact must be seen before subxact in decoding. 2020-02-19 08:59:18 +05:30
specs Stop demanding that top xact must be seen before subxact in decoding. 2020-02-19 08:59:18 +05:30
sql Fix potential assertion failure when reindexing a pg_class index. 2019-04-29 19:43:32 -07:00
.gitignore test_decoding: Update .gitignore 2014-03-31 14:18:35 -04:00
Makefile Stop demanding that top xact must be seen before subxact in decoding. 2020-02-19 08:59:18 +05:30
logical.conf Introduce logical decoding. 2014-03-03 16:32:18 -05:00
test_decoding.c Fix test_decoding's handling of nonexistant columns in old tuple versions. 2015-06-27 19:00:45 +02:00