Hi,

I found a suspicious code in pgoutput_startup().

175         /* Check if we support requested protocol */
176         if (data->protocol_version != LOGICALREP_PROTO_VERSION_NUM)
177             ereport(ERROR,
178                     (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
179                      errmsg("client sent proto_version=%d but we only 
support protocol %d or lower",
180                             data->protocol_version, 
LOGICALREP_PROTO_VERSION_NUM)));

Although the if condition is not-equal, the error message says 
"we only support protocol %d or lower".  Is this intentional?
Or should this be fixed as below? 

176         if (data->protocol_version > LOGICALREP_PROTO_VERSION_NUM)

Attached is a simple patch in case of fixing.

Regards,

-- 
Yugo Nagata <nag...@sraoss.co.jp>
diff --git a/src/backend/replication/pgoutput/pgoutput.c b/src/backend/replication/pgoutput/pgoutput.c
index 4a56288..370b74f 100644
--- a/src/backend/replication/pgoutput/pgoutput.c
+++ b/src/backend/replication/pgoutput/pgoutput.c
@@ -173,7 +173,7 @@ pgoutput_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt,
 								&data->publication_names);
 
 		/* Check if we support requested protocol */
-		if (data->protocol_version != LOGICALREP_PROTO_VERSION_NUM)
+		if (data->protocol_version > LOGICALREP_PROTO_VERSION_NUM)
 			ereport(ERROR,
 					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 					 errmsg("client sent proto_version=%d but we only support protocol %d or lower",
-- 
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