diff --git a/src/common/backend/utils/misc/guc/guc_sql.cpp b/src/common/backend/utils/misc/guc/guc_sql.cpp
index 26115af26..dc3657a5a 100755
--- a/src/common/backend/utils/misc/guc/guc_sql.cpp
+++ b/src/common/backend/utils/misc/guc/guc_sql.cpp
@@ -581,7 +581,7 @@ static void InitSqlConfigureNamesBool()
             gettext_noop("Enable llvm for executor."),
             NULL},
             &u_sess->attr.attr_sql.enable_codegen,
-            true,
+            false,
             NULL,
             NULL,
             NULL},
diff --git a/src/common/backend/utils/misc/postgresql_single.conf.sample b/src/common/backend/utils/misc/postgresql_single.conf.sample
index 3e78fabea..d75e5483a 100644
--- a/src/common/backend/utils/misc/postgresql_single.conf.sample
+++ b/src/common/backend/utils/misc/postgresql_single.conf.sample
@@ -800,7 +800,7 @@ audit_enabled = on
 #------------------------------------------------------------------------------
 # LLVM
 #------------------------------------------------------------------------------
-#enable_codegen = on			# consider use LLVM optimization
+#enable_codegen = off			# consider use LLVM optimization
 #enable_codegen_print = off		# dump the IR function
 #codegen_cost_threshold = 10000		# the threshold to allow use LLVM Optimization