feat: implement Display trait for FlushRegions

Signed-off-by: WenyXu <[email protected]>

Author: WenyXu

src/common/meta/src/instruction.rs

@@ -339,6 +339,16 @@ pub struct FlushRegions {
     pub error_strategy: FlushErrorStrategy,
 }
 
+impl Display for FlushRegions {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "FlushRegions(region_ids={:?}, strategy={:?}, error_strategy={:?})",
+            self.region_ids, self.strategy, self.error_strategy
+        )
+    }
+}
+
 impl FlushRegions {
     /// Create synchronous single-region flush
     pub fn sync_single(region_id: RegionId) -> Self {

src/datanode/src/heartbeat/handler/flush_region.rs

@@ -320,4 +320,15 @@ mod tests {
         assert!(flush_reply.results[0].1.is_ok());
         assert!(flush_reply.results[1].1.is_err());
     }
+
+    #[test]
+    fn test_flush_regions_display() {
+        let region_id = RegionId::new(1024, 1);
+        let flush_regions = FlushRegions::sync_single(region_id);
+        let display = format!("{}", flush_regions);
+        assert_eq!(
+            display,
+            "FlushRegions(region_ids=[4398046511105(1024, 1)], strategy=Sync, error_strategy=FailFast)"
+        );
+    }
 }