proxysql/deps/postgresql/pqsendpipelinesync.patch

diff --git src/interfaces/libpq/fe-exec.c src/interfaces/libpq/fe-exec.c
index b833e76..51ad8d8 100644
--- src/interfaces/libpq/fe-exec.c
+++ src/interfaces/libpq/fe-exec.c
@@ -4558,3 +4558,65 @@ int PShandleRowData(PGconn *conn, bool is_first_packet, PSresult* result) {
     return psHandleRowData(conn, is_first_packet, result);
 }
 
+int
+PQsendPipelineSync(PGconn *conn)
+{
+	PGcmdQueueEntry *entry;
+
+	if (!conn)
+		return 0;
+
+	if (conn->pipelineStatus == PQ_PIPELINE_OFF)
+	{
+		libpq_append_conn_error(conn, "cannot send pipeline when not in pipeline mode");
+		return 0;
+	}
+
+	switch (conn->asyncStatus)
+	{
+		case PGASYNC_COPY_IN:
+		case PGASYNC_COPY_OUT:
+		case PGASYNC_COPY_BOTH:
+			/* should be unreachable */
+			appendPQExpBufferStr(&conn->errorMessage,
+								 "internal error: cannot send pipeline while in COPY\n");
+			return 0;
+		case PGASYNC_READY:
+		case PGASYNC_READY_MORE:
+		case PGASYNC_BUSY:
+		case PGASYNC_IDLE:
+		case PGASYNC_PIPELINE_IDLE:
+			/* OK to send sync */
+			break;
+	}
+
+	entry = pqAllocCmdQueueEntry(conn);
+	if (entry == NULL)
+		return 0;				/* error msg already set */
+
+	entry->queryclass = PGQUERY_SYNC;
+	entry->query = NULL;
+
+	/* construct the Sync message */
+	if (pqPutMsgStart('S', conn) < 0 ||
+		pqPutMsgEnd(conn) < 0)
+		goto sendFailed;
+
+	/*
+	 * Give the data a push (in pipeline mode, only if we're past the size
+	 * threshold).  In nonblock mode, don't complain if we're unable to send
+	 * it all; PQgetResult() will do any additional flushing needed.
+	 */
+	if (pqPipelineFlush(conn) < 0)
+		goto sendFailed;
+
+	/* OK, it's launched! */
+	pqAppendCmdQueueEntry(conn, entry);
+
+	return 1;
+
+sendFailed:
+	pqRecycleCmdQueueEntry(conn, entry);
+	/* error message should be set up already */
+	return 0;
+}
diff --git src/interfaces/libpq/libpq-fe.h src/interfaces/libpq/libpq-fe.h
index 47f25e0..b769b64 100644
--- src/interfaces/libpq/libpq-fe.h
+++ src/interfaces/libpq/libpq-fe.h
@@ -688,6 +688,9 @@ extern const PGresult *PQgetResultFromPGconn(PGconn *conn);
 /* ProxySQL special handler function */
 extern int PShandleRowData(PGconn *conn, bool is_first_packet, PSresult* result);
 
+/* Send a pipeline sync message without flushing the send buffer */
+extern int	PQsendPipelineSync(PGconn *conn);
+
 #ifdef __cplusplus
 }
 #endif