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Introduce xid8-based functions to replace txid_XXX.

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The txid_XXX family of fmgr functions exposes 64 bit transaction IDs to
users as int8.  Now that we have an SQL type xid8 for FullTransactionId,
define a new set of functions including pg_current_xact_id() and
pg_current_snapshot() based on that.  Keep the old functions around too,
for now.

It's a bit sneaky to use the same C functions for both, but since the
binary representation is identical except for the signedness of the
type, and since older functions are the ones using the wrong signedness,
and since we'll presumably drop the older ones after a reasonable period
of time, it seems reasonable to switch to FullTransactionId internally
and share the code for both.

Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Takao Fujii <btfujiitkp@oss.nttdata.com>
Reviewed-by: Yoshikazu Imai <imai.yoshikazu@fujitsu.com>
Reviewed-by: Mark Dilger <mark.dilger@enterprisedb.com>
Discussion: https://postgr.es/m/20190725000636.666m5mad25wfbrri%40alap3.anarazel.de
This commit is contained in:
Thomas Munro
2020-04-07 11:33:56 +12:00
parent aeec457de8
commit 4c04be9b05
36 changed files with 871 additions and 355 deletions
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6
contrib/test_decoding/expected/ondisk_startup.out
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@@ -2,20 +2,20 @@ Parsed test spec with 3 sessions
starting permutation: s2b s2txid s1init s3b s3txid s2alter s2c s2b s2txid s3c s2c s1insert s1checkpoint s1start s1insert s1alter s1insert s1start
step s2b: BEGIN;
step s2txid: SELECT txid_current() IS NULL;
step s2txid: SELECT pg_current_xact_id() IS NULL;
?column?
f
step s1init: SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding'); <waiting ...>
step s3b: BEGIN;
step s3txid: SELECT txid_current() IS NULL;
step s3txid: SELECT pg_current_xact_id() IS NULL;
?column?
f
step s2alter: ALTER TABLE do_write ADD COLUMN addedbys2 int;
step s2c: COMMIT;
step s2b: BEGIN;
step s2txid: SELECT txid_current() IS NULL;
step s2txid: SELECT pg_current_xact_id() IS NULL;
?column?
f