Fix logical replication with different encodings

reported by Shinoda, Noriyoshi <noriyoshi.shinoda@hpe.com>; partial
patch by Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>

src/backend/replication/libpqwalreceiver/libpqwalreceiver.c

@@ -22,6 +22,7 @@
 #include "libpq-fe.h"
 #include "pqexpbuffer.h"
 #include "access/xlog.h"
+#include "mb/pg_wchar.h"
 #include "miscadmin.h"
 #include "pgstat.h"
 #include "replication/logicalproto.h"
@@ -134,9 +135,16 @@ libpqrcv_connect(const char *conninfo, bool logical, const char *appname,
 	}
 	keys[++i] = "fallback_application_name";
 	vals[i] = appname;
+	if (logical)
+	{
+		keys[++i] = "client_encoding";
+		vals[i] = GetDatabaseEncodingName();
+	}
 	keys[++i] = NULL;
 	vals[i] = NULL;
 
+	Assert(i < sizeof(keys));
+
 	conn = palloc0(sizeof(WalReceiverConn));
 	conn->streamConn = PQconnectdbParams(keys, vals, /* expand_dbname = */ true);
 	if (PQstatus(conn->streamConn) != CONNECTION_OK)

src/backend/replication/logical/proto.c

@@ -444,7 +444,7 @@ logicalrep_write_tuple(StringInfo out, Relation rel, HeapTuple tuple)
 		outputstr = OidOutputFunctionCall(typclass->typoutput, values[i]);
 		len = strlen(outputstr) + 1;	/* null terminated */
 		pq_sendint(out, len, 4);		/* length */
-		appendBinaryStringInfo(out, outputstr, len); /* data */
+		pq_sendstring(out, outputstr);	/* data */
 
 		pfree(outputstr);