chore: default enalbe merge into (#15034)

Author: BohuTANG

src/query/settings/src/settings_default.rs

@@ -290,7 +290,7 @@ impl DefaultSettings {
                     mode: SettingMode::Both,
                     range: Some(SettingRange::Numeric(0..=u64::MAX)),
                 }),
-                ("inlist_to_join_threshold", DefaultSettingValue{
+                ("inlist_to_join_threshold", DefaultSettingValue {
                     value: UserSettingValue::UInt64(1024),
                     desc: "Set the threshold for converting IN list to JOIN.",
                     mode: SettingMode::Both,
@@ -493,7 +493,7 @@ impl DefaultSettings {
                     range: Some(SettingRange::Numeric(0..=1)),
                 }),
                 ("enable_experimental_merge_into", DefaultSettingValue {
-                    value: UserSettingValue::UInt64(0),
+                    value: UserSettingValue::UInt64(1),
                     desc: "Enables the experimental feature for 'MERGE INTO'.",
                     mode: SettingMode::Both,
                     range: Some(SettingRange::Numeric(0..=1)),