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Tom Lane 07ee62ce9e Propagate xactStartTimestamp and stmtStartTimestamp to parallel workers. 
Previously, a worker process would establish values for these based on
its own start time.  In v10 and up, this can trivially be shown to cause
misbehavior of transaction_timestamp(), timestamp_in(), and related
functions which are (perhaps unwisely?) marked parallel-safe.  It seems
likely that other behaviors might diverge from what happens in the parent
as well.

It's not as trivial to demonstrate problems in 9.6 or 9.5, but I'm sure
it's still possible, so back-patch to all branches containing parallel
worker infrastructure.

In HEAD only, mark now() and statement_timestamp() as parallel-safe
(other affected functions already were).  While in theory we could
still squeeze that change into v11, it doesn't seem important enough
to force a last-minute catversion bump.

Konstantin Knizhnik, whacked around a bit by me

Discussion: https://postgr.es/m/6406dbd2-5d37-4cb6-6eb2-9c44172c7e7c@postgrespro.ru
2018-10-06 12:00:09 -04:00
..
amapi.h Support index INCLUDE in the AM properties interface. 2018-04-08 06:02:05 +01:00
amvalidate.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
attnum.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_internal.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_page.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_pageops.h Improve FSM management for BRIN indexes. 2018-04-04 14:26:04 -04:00
brin_revmap.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_tuple.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_xlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
bufmask.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
clog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
commit_ts.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
genam.h Add support for nearest-neighbor (KNN) searches to SP-GiST 2018-09-19 01:54:10 +03:00
generic_xlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gin.h Use stdbool.h if suitable 2018-03-22 20:42:25 -04:00
gin_private.h Re-think predicate locking on GIN indexes. 2018-05-04 11:27:50 +03:00
ginblock.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
ginxlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gist.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gist_private.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gistscan.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gistxlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
hash.h Fix the overrun in hash index metapage for smaller block sizes. 2018-09-06 09:27:19 +05:30
hash_xlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
heapam.h Revert MERGE patch 2018-04-12 11:22:56 +01:00
heapam_xlog.h Post-feature-freeze pgindent run. 2018-04-26 14:47:16 -04:00
hio.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
htup.h Add FIELDNO_* macro designating offset into structs required for JIT. 2018-03-22 14:45:59 -07:00
htup_details.h Improve representation of 'moved partitions' indicator on deleted tuples. 2018-05-01 13:30:12 -07:00
itup.h Adjust INCLUDE index truncation comments and code. 2018-04-19 08:45:58 +03:00
multixact.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
nbtree.h Allow btree comparison functions to return INT_MIN. 2018-10-05 16:01:29 -04:00
nbtxlog.h Fix datatype for number of heap tuples during last cleanup 2018-04-19 11:28:03 +03:00
parallel.h Support parallel btree index builds. 2018-02-02 13:32:44 -05:00
printsimple.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
printtup.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
reloptions.h Post-feature-freeze pgindent run. 2018-04-26 14:47:16 -04:00
relscan.h Post-feature-freeze pgindent run. 2018-04-26 14:47:16 -04:00
rewriteheap.h Comment fix for rewriteheap.h. 2018-08-25 09:17:14 -07:00
rmgr.h Phase 2 of pgindent updates. 2017-06-21 15:19:25 -04:00
rmgrlist.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
sdir.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
session.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
skey.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
slru.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
spgist.h Add support for nearest-neighbor (KNN) searches to SP-GiST 2018-09-19 01:54:10 +03:00
spgist_private.h Add support for nearest-neighbor (KNN) searches to SP-GiST 2018-09-19 01:54:10 +03:00
spgxlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
stratnum.h Add prefix operator for TEXT type. 2018-04-03 19:46:45 +03:00
subtrans.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
sysattr.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
timeline.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
transam.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
tsmapi.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
tupconvert.h Use slots more widely in tuple mapping code and make naming more consistent. 2018-10-02 11:14:26 -07:00
tupdesc.h Fast ALTER TABLE ADD COLUMN with a non-NULL default 2018-03-28 10:43:52 +10:30
tupdesc_details.h Cosmetic improvements for faster column addition. 2018-06-27 08:16:13 +05:30
tupmacs.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
tuptoaster.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
twophase.h Post-feature-freeze pgindent run. 2018-04-26 14:47:16 -04:00
twophase_rmgr.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
valid.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
visibilitymap.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xact.h Propagate xactStartTimestamp and stmtStartTimestamp to parallel workers. 2018-10-06 12:00:09 -04:00
xlog.h Revert "Allow on-line enabling and disabling of data checksums" 2018-04-09 19:03:42 +02:00
xlog_internal.h Flip argument order in XLogSegNoOffsetToRecPtr 2018-07-09 14:33:38 -04:00
xlogdefs.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xloginsert.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xlogreader.h pgindent run prior to branching 2018-06-30 12:25:49 -04:00
xlogrecord.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xlogutils.h Update copyright for 2018 2018-01-02 23:30:12 -05:00