feat: support scan metrics of FileStoreScan to align with ScanMetrics

Author: SteNicholas

src/paimon/core/operation/file_store_scan.cpp

@@ -160,6 +160,7 @@ Status FileStoreScan::ReadManifests(std::optional<Snapshot>* snapshot_ptr,
     }
     if (snapshot == std::nullopt) {
         filtered_manifests = std::vector<ManifestFileMeta>();
+        all_manifests = std::vector<ManifestFileMeta>();
         return Status::OK();
     }
     PAIMON_RETURN_NOT_OK(ReadManifestsWithSnapshot(snapshot.value(), &all_manifests));

src/paimon/core/operation/key_value_file_store_scan_test.cpp

@@ -144,12 +144,27 @@ TEST_F(KeyValueFileStoreScanTest, TestMaxSequenceNumber) {
                              CreateFileStoreScan(table_path, scan_filter,
                                                  /*table_schema_id=*/0, /*snapshot_id=*/2));
 
+        const auto started = std::chrono::high_resolution_clock::now();
         ASSERT_OK_AND_ASSIGN(std::shared_ptr<FileStoreScan::RawPlan> raw_plan, scan->CreatePlan());
         std::shared_ptr<Metrics> metrics = scan->GetScanMetrics();
         ASSERT_TRUE(metrics);
+        ASSERT_OK_AND_ASSIGN(uint64_t last_scan_duration,
+                             metrics->GetCounter(ScanMetrics::LAST_SCAN_DURATION));
+        ASSERT_LE(last_scan_duration, std::chrono::duration_cast<std::chrono::milliseconds>(
+                                          std::chrono::high_resolution_clock::now() - started)
+                                          .count());
         ASSERT_OK_AND_ASSIGN(uint64_t last_scanned_snapshot_id,
                              metrics->GetCounter(ScanMetrics::LAST_SCANNED_SNAPSHOT_ID));
-        ASSERT_EQ(2u, last_scanned_snapshot_id);
+        ASSERT_EQ(last_scanned_snapshot_id, 2u);
+        ASSERT_OK_AND_ASSIGN(uint64_t last_scanned_manifests,
+                             metrics->GetCounter(ScanMetrics::LAST_SCANNED_MANIFESTS));
+        ASSERT_EQ(last_scanned_manifests, 1u);
+        ASSERT_OK_AND_ASSIGN(uint64_t last_scan_skipped_table_files,
+                             metrics->GetCounter(ScanMetrics::LAST_SCAN_SKIPPED_TABLE_FILES));
+        ASSERT_EQ(last_scan_skipped_table_files, 0u);
+        ASSERT_OK_AND_ASSIGN(uint64_t last_scan_resulted_table_files,
+                             metrics->GetCounter(ScanMetrics::LAST_SCAN_RESULTED_TABLE_FILES));
+        ASSERT_EQ(last_scan_resulted_table_files, 1u);
         int64_t max_sequence_num = GetMaxSequenceNumberOfRawPlan(raw_plan);
         ASSERT_EQ(max_sequence_num, 1);
         // test multiple scan