Fix commit_ts for FrozenXid and BootstrapXid

Previously, requesting commit timestamp for transactions
FrozenTransactionId and BootstrapTransactionId resulted in an error.
But since those values can validly appear in committed tuples' Xmin,
this behavior is unhelpful and error prone: each caller would have to
special-case those values before requesting timestamp data for an Xid.
We already have a perfectly good interface for returning "the Xid you
requested is too old for us to have commit TS data for it", so let's use
that instead.

Backpatch to 9.5, where commit timestamps appeared.

Author: Craig Ringer
Discussion: https://www.postgresql.org/message-id/CAMsr+YFM5Q=+ry3mKvWEqRTxrB0iU3qUSRnS28nz6FJYtBwhJg@mail.gmail.com

3 files changed, 24 insertions, 14 deletions

diff --git a/src/test/modules/commit_ts/expected/commit_timestamp.out b/src/test/modules/commit_ts/expected/commit_timestamp.out
index 99f3322c421..5b7783b58f3 100644
--- a/src/test/modules/commit_ts/expected/commit_timestamp.out
+++ b/src/test/modules/commit_ts/expected/commit_timestamp.out
@@ -28,9 +28,17 @@ DROP TABLE committs_test;
 SELECT pg_xact_commit_timestamp('0'::xid);
 ERROR:  cannot retrieve commit timestamp for transaction 0
 SELECT pg_xact_commit_timestamp('1'::xid);
-ERROR:  cannot retrieve commit timestamp for transaction 1
+ pg_xact_commit_timestamp 
+--------------------------
+ 
+(1 row)
+
 SELECT pg_xact_commit_timestamp('2'::xid);
-ERROR:  cannot retrieve commit timestamp for transaction 2
+ pg_xact_commit_timestamp 
+--------------------------
+ 
+(1 row)
+
 SELECT x.xid::text::bigint > 0, x.timestamp > '-infinity'::timestamptz, x.timestamp <= now() FROM pg_last_committed_xact() x;
  ?column? | ?column? | ?column? 
 ----------+----------+----------
diff --git a/src/test/modules/commit_ts/expected/commit_timestamp_1.out b/src/test/modules/commit_ts/expected/commit_timestamp_1.out
index 2f1f41d2099..c10b0abc2b7 100644
--- a/src/test/modules/commit_ts/expected/commit_timestamp_1.out
+++ b/src/test/modules/commit_ts/expected/commit_timestamp_1.out
@@ -23,9 +23,17 @@ DROP TABLE committs_test;
 SELECT pg_xact_commit_timestamp('0'::xid);
 ERROR:  cannot retrieve commit timestamp for transaction 0
 SELECT pg_xact_commit_timestamp('1'::xid);
-ERROR:  cannot retrieve commit timestamp for transaction 1
+ pg_xact_commit_timestamp 
+--------------------------
+ 
+(1 row)
+
 SELECT pg_xact_commit_timestamp('2'::xid);
-ERROR:  cannot retrieve commit timestamp for transaction 2
+ pg_xact_commit_timestamp 
+--------------------------
+ 
+(1 row)
+
 SELECT x.xid::text::bigint > 0, x.timestamp > '-infinity'::timestamptz, x.timestamp <= now() FROM pg_last_committed_xact() x;
 ERROR:  could not get commit timestamp data
 HINT:  Make sure the configuration parameter "track_commit_timestamp" is set.
diff --git a/src/test/modules/commit_ts/t/004_restart.pl b/src/test/modules/commit_ts/t/004_restart.pl
index 900e9b79708..32be07c7414 100644
--- a/src/test/modules/commit_ts/t/004_restart.pl
+++ b/src/test/modules/commit_ts/t/004_restart.pl
@@ -25,19 +25,13 @@ like(
 
 ($ret, $stdout, $stderr) =
   $node_master->psql('postgres', qq[SELECT pg_xact_commit_timestamp('1');]);
-is($ret, 3, 'getting ts of BootstrapTransactionId reports error');
-like(
-	$stderr,
-	qr/cannot retrieve commit timestamp for transaction/,
-	'expected error from BootstrapTransactionId');
+is($ret, 0, 'getting ts of BootstrapTransactionId succeeds');
+is($stdout, '', 'timestamp of BootstrapTransactionId is null');
 
 ($ret, $stdout, $stderr) =
   $node_master->psql('postgres', qq[SELECT pg_xact_commit_timestamp('2');]);
-is($ret, 3, 'getting ts of FrozenTransactionId reports error');
-like(
-	$stderr,
-	qr/cannot retrieve commit timestamp for transaction/,
-	'expected error from FrozenTransactionId');
+is($ret, 0, 'getting ts of FrozenTransactionId succeeds');
+is($stdout, '', 'timestamp of FrozenTransactionId is null');
 
 # Since FirstNormalTransactionId will've occurred during initdb, long before we
 # enabled commit timestamps, it'll be null since we have no cts data for it but