Improve error message in WAL sender

The previous error message when attempting to run a general SQL command
in a physical replication WAL sender was a bit sloppy.

Reported-by: Fujii Masao <masao.fujii@gmail.com>

diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index db346e6edbdbcc6a95dd51ca1cb3b34849080e5e..1fbe8ed71b05d5c2f22a607e7e26ada5b70e977e 100644 (file)
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -1545,7 +1545,7 @@ exec_replication_command(const char *cmd_string)
                case T_SQLCmd:
                        if (MyDatabaseId == InvalidOid)
                                ereport(ERROR,
-                                               (errmsg("not connected to database")));
+                                               (errmsg("cannot execute SQL commands in WAL sender for physical replication")));
 
                        /* Tell the caller that this wasn't a WalSender command. */
                        return false;