From 61fc7a129cd90cef3fcbb40b4ef786462e2de651 Mon Sep 17 00:00:00 2001
From: Rene Cannao <rene@proxysql.com>
Date: Tue, 31 Mar 2026 07:28:30 +0000
Subject: [PATCH] Disable FFTO by default in 3.1.x, keep enabled in 4.0.x
 (#5539)

Gate the ffto_enabled default on PROXYSQLGENAI so that:
- 3.1.x (PROXYSQL31): FFTO compiled in but disabled by default
- 4.0.x (PROXYSQLGENAI): FFTO enabled by default (unchanged)

Users on 3.1.x can still opt in via SET mysql-ffto_enabled='true'.
---
 lib/MySQL_Thread.cpp | 4 ++++
 lib/PgSQL_Thread.cpp | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/lib/MySQL_Thread.cpp b/lib/MySQL_Thread.cpp
index 079f108dc..ab5932bd7 100644
--- a/lib/MySQL_Thread.cpp
+++ b/lib/MySQL_Thread.cpp
@@ -1362,7 +1362,11 @@ MySQL_Threads_Handler::MySQL_Threads_Handler() {
 	variables.ping_timeout_server=200;
 	variables.fast_forward_grace_close_ms=5000;
 #ifdef PROXYSQLFFTO
+#ifdef PROXYSQLGENAI
 	variables.ffto_enabled=true;
+#else
+	variables.ffto_enabled=false;
+#endif
 	variables.ffto_max_buffer_size=1048576;
 #endif
 	variables.default_schema=strdup((char *)"information_schema");
diff --git a/lib/PgSQL_Thread.cpp b/lib/PgSQL_Thread.cpp
index 23e279305..91f6c98d4 100644
--- a/lib/PgSQL_Thread.cpp
+++ b/lib/PgSQL_Thread.cpp
@@ -1039,7 +1039,11 @@ PgSQL_Threads_Handler::PgSQL_Threads_Handler() {
 	variables.shun_on_failures = 5;
 	variables.shun_recovery_time_sec = 10;
 #ifdef PROXYSQLFFTO
+#ifdef PROXYSQLGENAI
 	variables.ffto_enabled = true;
+#else
+	variables.ffto_enabled = false;
+#endif
 	variables.ffto_max_buffer_size = 1048576;
 #endif
 	variables.unshun_algorithm = 0;