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Revert "Fix bug in checking of IDENTIFY_SYSTEM result."

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This reverts commit 083d29c65b.

The commit changed the code so that it causes an errors when
IDENTIFY_SYSTEM returns three columns. But which prevents us
from using the replication-related utilities against the server
with older version. This is not what we want. For that
compatibility, we allow the utilities to receive three columns
as the result of IDENTIFY_SYSTEM eventhough it actually returns
four columns in 9.4 or later.

Pointed out by Andres Freund.
This commit is contained in:
Fujii Masao
2014-08-19 18:30:38 +09:00
parent 083d29c65b
commit c476288653
4 changed files with 8 additions and 8 deletions
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4
src/backend/replication/libpqwalreceiver/libpqwalreceiver.c
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@@ -131,7 +131,7 @@ libpqrcv_identify_system(TimeLineID *primary_tli)
"the primary server: %s",
PQerrorMessage(streamConn))));
}
if (PQnfields(res) < 4 || PQntuples(res) != 1)
if (PQnfields(res) < 3 || PQntuples(res) != 1)
{
int ntuples = PQntuples(res);
int nfields = PQnfields(res);
@@ -140,7 +140,7 @@ libpqrcv_identify_system(TimeLineID *primary_tli)
ereport(ERROR,
(errmsg("invalid response from primary server"),
errdetail("Could not identify system: got %d rows and %d fields, expected %d rows and %d or more fields.",
ntuples, nfields, 4, 1)));
ntuples, nfields, 3, 1)));
}
primary_sysid = PQgetvalue(res, 0, 0);
*primary_tli = pg_atoi(PQgetvalue(res, 0, 1), 4, 0);