v1-0001-Bump-protocol-version-to-3.3.patch

From b329eb7426d47561c30d5faba8bdf0b0bf9838ae Mon Sep 17 00:00:00 2001
From: Jelte Fennema-Nio <postgres@jeltef.nl>
Date: Sun, 19 Oct 2025 00:30:48 +0200
Subject: [PATCH v1 1/3] Bump protocol version to 3.3

This commit increments the PostgreSQL frontend/backend protocol version
from 3.2 to 3.3 and does the required boilerplate changes. The next
commit will introduce an actual protocol change.
---
 doc/src/sgml/protocol.sgml                    |  4 ++--
 src/include/libpq/pqcomm.h                    |  2 +-
 src/interfaces/libpq/fe-connect.c             | 12 ++++++++++
 .../modules/libpq_pipeline/libpq_pipeline.c   | 22 ++++++++++++++++---
 4 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index 9d755232873..8234079deba 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -18,8 +18,8 @@
  </para>
 
  <para>
-  This document describes version 3.2 of the protocol, introduced in
-  <productname>PostgreSQL</productname> version 18. The server and the libpq
+  This document describes version 3.3 of the protocol, introduced in
+  <productname>PostgreSQL</productname> version 19. The server and the libpq
   client library are backwards compatible with protocol version 3.0,
   implemented in <productname>PostgreSQL</productname> 7.4 and later.
  </para>
diff --git a/src/include/libpq/pqcomm.h b/src/include/libpq/pqcomm.h
index f04ca135653..2423394b348 100644
--- a/src/include/libpq/pqcomm.h
+++ b/src/include/libpq/pqcomm.h
@@ -94,7 +94,7 @@ is_unixsock_path(const char *path)
  */
 
 #define PG_PROTOCOL_EARLIEST	PG_PROTOCOL(3,0)
-#define PG_PROTOCOL_LATEST		PG_PROTOCOL(3,2)
+#define PG_PROTOCOL_LATEST		PG_PROTOCOL(3,3)
 
 typedef uint32 ProtocolVersion; /* FE/BE protocol version number */
 
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index a3d12931fff..76f9ce3a23e 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -8301,6 +8301,18 @@ pqParseProtocolVersion(const char *value, ProtocolVersion *result, PGconn *conn,
 		return true;
 	}
 
+	if (strcmp(value, "3.3") == 0)
+	{
+		*result = PG_PROTOCOL(3, 3);
+		return true;
+	}
+
+	if (strcmp(value, "latest") == 0)
+	{
+		*result = PG_PROTOCOL_LATEST;
+		return true;
+	}
+
 	libpq_append_conn_error(conn, "invalid %s value: \"%s\"",
 							context, value);
 	return false;
diff --git a/src/test/modules/libpq_pipeline/libpq_pipeline.c b/src/test/modules/libpq_pipeline/libpq_pipeline.c
index b3af70fa09b..0b113b271ea 100644
--- a/src/test/modules/libpq_pipeline/libpq_pipeline.c
+++ b/src/test/modules/libpq_pipeline/libpq_pipeline.c
@@ -1405,7 +1405,23 @@ test_protocol_version(PGconn *conn)
 	PQfinish(conn);
 
 	/*
-	 * Test max_protocol_version=latest. 'latest' currently means '3.2'.
+	 * Test max_protocol_version=3.3
+	 */
+	vals[max_protocol_version_index] = "3.3";
+	conn = PQconnectdbParams(keywords, vals, false);
+
+	if (PQstatus(conn) != CONNECTION_OK)
+		pg_fatal("Connection to database failed: %s",
+				 PQerrorMessage(conn));
+
+	protocol_version = PQfullProtocolVersion(conn);
+	if (protocol_version != 30003)
+		pg_fatal("expected 30003, got %d", protocol_version);
+
+	PQfinish(conn);
+
+	/*
+	 * Test max_protocol_version=latest. 'latest' currently means '3.3'.
 	 */
 	vals[max_protocol_version_index] = "latest";
 	conn = PQconnectdbParams(keywords, vals, false);
@@ -1415,8 +1431,8 @@ test_protocol_version(PGconn *conn)
 				 PQerrorMessage(conn));
 
 	protocol_version = PQfullProtocolVersion(conn);
-	if (protocol_version != 30002)
-		pg_fatal("expected 30002, got %d", protocol_version);
+	if (protocol_version != 30003)
+		pg_fatal("expected 30003, got %d", protocol_version);
 
 	PQfinish(conn);
 
-- 
2.51.1