diff --git a/br/pkg/lightning/mydump/loader.go b/br/pkg/lightning/mydump/loader.go
index 98661d3a46f8c..a3d3a3adeb93d 100644
--- a/br/pkg/lightning/mydump/loader.go
+++ b/br/pkg/lightning/mydump/loader.go
@@ -505,12 +505,30 @@ func (s *mdLoaderSetup) route() error {
 		}
 	}
 	for _, info := range s.tableSchemas {
+		if _, ok := knownDBNames[info.TableName.Schema]; !ok {
+			knownDBNames[info.TableName.Schema] = &dbInfo{
+				fileMeta: info.FileMeta,
+				count:    1,
+			}
+		}
 		knownDBNames[info.TableName.Schema].count++
 	}
 	for _, info := range s.viewSchemas {
+		if _, ok := knownDBNames[info.TableName.Schema]; !ok {
+			knownDBNames[info.TableName.Schema] = &dbInfo{
+				fileMeta: info.FileMeta,
+				count:    1,
+			}
+		}
 		knownDBNames[info.TableName.Schema].count++
 	}
 	for _, info := range s.tableDatas {
+		if _, ok := knownDBNames[info.TableName.Schema]; !ok {
+			knownDBNames[info.TableName.Schema] = &dbInfo{
+				fileMeta: info.FileMeta,
+				count:    1,
+			}
+		}
 		knownDBNames[info.TableName.Schema].count++
 	}
 
diff --git a/br/pkg/lightning/mydump/loader_test.go b/br/pkg/lightning/mydump/loader_test.go
index da910c70bedc0..7ea0ef2b0a8a6 100644
--- a/br/pkg/lightning/mydump/loader_test.go
+++ b/br/pkg/lightning/mydump/loader_test.go
@@ -686,6 +686,23 @@ func TestRouter(t *testing.T) {
 	}
 }
 
+func TestRoutesPanic(t *testing.T) {
+	s := newTestMydumpLoaderSuite(t)
+	s.cfg.Routes = []*router.TableRule{
+		{
+			SchemaPattern: "test1",
+			TargetSchema:  "test",
+		},
+	}
+
+	s.touch(t, "test1.dump_test.001.sql")
+	s.touch(t, "test1.dump_test.002.sql")
+	s.touch(t, "test1.dump_test.003.sql")
+
+	_, err := md.NewMyDumpLoader(context.Background(), s.cfg)
+	require.NoError(t, err)
+}
+
 func TestBadRouterRule(t *testing.T) {
 	s := newTestMydumpLoaderSuite(t)
 
diff --git a/br/tests/lightning_routes_panic/config.toml b/br/tests/lightning_routes_panic/config.toml
new file mode 100644
index 0000000000000..1e6e444e7fe74
--- /dev/null
+++ b/br/tests/lightning_routes_panic/config.toml
@@ -0,0 +1,9 @@
+[tikv-importer]
+backend = 'local'
+
+# here we're verifying that routes does not panic for csv data load.
+[[routes]]
+schema-pattern = "test1"
+table-pattern = "d*"
+target-schema = "test"
+target-table = "u"
diff --git a/br/tests/lightning_routes_panic/data/test1.dump_test.001.sql b/br/tests/lightning_routes_panic/data/test1.dump_test.001.sql
new file mode 100644
index 0000000000000..22f20b3808dd1
--- /dev/null
+++ b/br/tests/lightning_routes_panic/data/test1.dump_test.001.sql
@@ -0,0 +1 @@
+insert into dump_test values (1.0);
diff --git a/br/tests/lightning_routes_panic/data/test1.dump_test.002.sql b/br/tests/lightning_routes_panic/data/test1.dump_test.002.sql
new file mode 100644
index 0000000000000..e1bfd3fd8f7c1
--- /dev/null
+++ b/br/tests/lightning_routes_panic/data/test1.dump_test.002.sql
@@ -0,0 +1 @@
+insert into dump_test values (6.0);
diff --git a/br/tests/lightning_routes_panic/data/test1.dump_test.003.sql b/br/tests/lightning_routes_panic/data/test1.dump_test.003.sql
new file mode 100644
index 0000000000000..403e49b03fbf4
--- /dev/null
+++ b/br/tests/lightning_routes_panic/data/test1.dump_test.003.sql
@@ -0,0 +1 @@
+insert into dump_test values (36.0);
diff --git a/br/tests/lightning_routes_panic/run.sh b/br/tests/lightning_routes_panic/run.sh
new file mode 100755
index 0000000000000..37661999b3320
--- /dev/null
+++ b/br/tests/lightning_routes_panic/run.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# Basic check for whether routing rules work
+
+set -eux
+
+run_sql 'DROP DATABASE IF EXISTS test1;'
+run_sql 'DROP DATABASE IF EXISTS test;'
+
+run_sql 'CREATE DATABASE test1;'
+run_sql 'CREATE DATABASE test;'
+run_sql 'CREATE TABLE test1.dump_test (x real primary key);'
+run_sql 'CREATE TABLE test.u (x real primary key);'
+
+run_lightning
+
+run_sql 'SELECT sum(x) FROM test.u;'
+check_contains 'sum(x): 43'
diff --git a/br/tests/run_group.sh b/br/tests/run_group.sh
new file mode 100755
index 0000000000000..41348316fc12e
--- /dev/null
+++ b/br/tests/run_group.sh
@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+
+# This script split the integration tests into 16 groups to support parallel group tests execution.
+# all the integration tests are located in br/tests directory. only the directories
+# containing run.sh will be considered as integration tests. the script will print the total # # # number
+
+set -eo pipefail
+
+# Step 1
+CUR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+group=$1
+
+
+# Define groups
+# Note: If new group is added, the group name must also be added to CI
+# * https://github.com/PingCAP-QE/ci/blob/main/pipelines/pingcap/tidb/latest/pull_br_integration_test.groovy
+# Each group of tests consumes as much time as possible, thus reducing CI waiting time.
+# Putting multiple light tests together and heavy tests in a separate group.
+declare -A groups
+groups=(
+	["G00"]="br_300_small_tables br_backup_empty br_backup_version br_cache_table br_case_sensitive br_charset_gbk br_check_new_collocation_enable"
+	["G01"]="br_crypter2 br_db br_db_online br_db_online_newkv br_db_skip br_debug_meta br_ebs br_foreign_key br_full"
+	["G02"]="br_full_cluster_restore br_full_ddl br_full_index br_gcs br_history"
+    ["G03"]='br_incompatible_tidb_config br_incremental br_incremental_ddl br_incremental_index'
+	["G04"]='br_incremental_only_ddl br_incremental_same_table br_insert_after_restore br_key_locked br_log_test br_move_backup br_mv_index br_other br_partition_add_index'
+	["G05"]='br_range br_rawkv br_replica_read br_restore_TDE_enable br_restore_log_task_enable br_s3 br_shuffle_leader br_shuffle_region br_single_table'
+	["G06"]='br_skip_checksum br_small_batch_size br_split_region_fail br_systables br_table_filter'
+	["G07"]='br_clustered_index br_crypter br_table_partition br_tidb_placement_policy br_tiflash br_tikv_outage'
+	["G08"]='br_tikv_outage2 br_ttl br_views_and_sequences br_z_gc_safepoint lightning_add_index lightning_alter_random lightning_auto_columns'
+	["G09"]='lightning_auto_random_default lightning_bom_file lightning_character_sets lightning_check_partial_imported lightning_checkpoint lightning_checkpoint_chunks lightning_checkpoint_columns lightning_checkpoint_dirty_tableid'
+	["G10"]='lightning_checkpoint_engines lightning_checkpoint_engines_order lightning_checkpoint_error_destroy lightning_checkpoint_parquet lightning_checkpoint_timestamp lightning_checksum_mismatch lightning_cmdline_override lightning_column_permutation lightning_common_handle'
+	["G11"]='lightning_compress lightning_concurrent-restore lightning_config_max_error lightning_config_skip_csv_header lightning_csv lightning_default-columns lightning_disable_scheduler_by_key_range lightning_disk_quota lightning_distributed_import'
+	["G12"]='lightning_drop_other_tables_halfway lightning_duplicate_detection lightning_duplicate_detection_new lightning_duplicate_resolution lightning_duplicate_resolution_incremental lightning_error_summary lightning_examples lightning_exotic_filenames lightning_extend_routes lightning_fail_fast'
+	["G13"]='lightning_fail_fast_on_nonretry_err lightning_file_routing lightning_foreign_key lightning_gcs lightning_generated_columns lightning_ignore_columns lightning_import_compress lightning_incremental lightning_issue_282'
+	["G14"]='lightning_issue_40657 lightning_issue_410 lightning_issue_519 lightning_local_backend lightning_max_incr lightning_max_random lightning_multi_valued_index lightning_new_collation lightning_no_schema'
+	["G15"]='lightning_parquet lightning_partition_incremental lightning_partitioned-table lightning_record_network lightning_reload_cert lightning_restore lightning_routes lightning_routes_panic lightning_row-format-v2 lightning_s3'
+	["G16"]='lightning_shard_rowid lightning_source_linkfile lightning_sqlmode lightning_tidb_duplicate_data lightning_tidb_rowid lightning_tiflash lightning_tikv_multi_rocksdb lightning_too_many_columns lightning_tool_135'
+	["G17"]='lightning_tool_1420 lightning_tool_1472 lightning_tool_241 lightning_ttl lightning_unused_config_keys lightning_various_types lightning_view lightning_write_batch lightning_write_limit'
+)
+
+# Get other cases not in groups, to avoid missing any case
+others=()
+for script in "$CUR"/*/run.sh; do
+	test_name="$(basename "$(dirname "$script")")"
+	# shellcheck disable=SC2076
+	if [[ ! " ${groups[*]} " =~ " ${test_name} " ]]; then
+		others=("${others[@]} ${test_name}")
+	fi
+done
+
+if [[ "$group" == "others" ]]; then
+	if [[ -z $others ]]; then
+		echo "All br&lightning integration test cases have been added to groups"
+		exit 0
+	fi
+	echo "Error: "$others" is not added to any group in br/tests/run_group.sh"
+	exit 1
+elif [[ " ${!groups[*]} " =~ " ${group} " ]]; then
+	test_names="${groups[${group}]}"
+	# Run test cases
+	if [[ -n $test_names ]]; then
+		echo ""
+		echo "Run cases: ${test_names}"
+        for case_name in $test_names; do
+            echo "Run cases: ${case_name}"
+            rm -rf /tmp/backup_restore_test
+            mkdir -p /tmp/backup_restore_test
+            rm -rf cover
+            mkdir cover
+            TEST_NAME=${case_name} ${CUR}/run.sh
+        done
+	fi
+else
+	echo "Error: invalid group name: ${group}"
+	exit 1
+fi