From c370bb7560b1db2ce7c8ede7a1fa9e6216f3b8ea Mon Sep 17 00:00:00 2001
From: zwang28 <70626450+zwang28@users.noreply.github.com>
Date: Tue, 19 Nov 2024 17:20:51 +0800
Subject: [PATCH] refactor: allow modification of the query mode (#19424)

---
 e2e_test/ddl/alter_session_params.slt | 3 ---
 src/common/src/session_config/mod.rs  | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/e2e_test/ddl/alter_session_params.slt b/e2e_test/ddl/alter_session_params.slt
index ba5cdff21ef12..ff2e5b8dd3f12 100644
--- a/e2e_test/ddl/alter_session_params.slt
+++ b/e2e_test/ddl/alter_session_params.slt
@@ -1,9 +1,6 @@
 statement ok
 set RW_STREAMING_ENABLE_DELTA_JOIN to true;
 
-statement error session param query_mode cannot be altered system wide
-alter system set query_mode to auto;
-
 connection other1
 query T
 show RW_STREAMING_ENABLE_DELTA_JOIN;
diff --git a/src/common/src/session_config/mod.rs b/src/common/src/session_config/mod.rs
index 163aa18799390..94b2650002e47 100644
--- a/src/common/src/session_config/mod.rs
+++ b/src/common/src/session_config/mod.rs
@@ -76,7 +76,7 @@ pub struct SessionConfig {
     /// The default value is auto which means let the system decide to run batch queries in local
     /// or distributed mode automatically.
     #[serde_as(as = "DisplayFromStr")]
-    #[parameter(default = QueryMode::default(), flags = "NO_ALTER_SYS")]
+    #[parameter(default = QueryMode::default())]
     query_mode: QueryMode,
 
     /// Sets the number of digits displayed for floating-point values.