lightning: fix routes panic for csv data load (#45405)

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++
 	}
 

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)
 

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"

br/tests/lightning_routes_panic/data/test1.dump_test.001.sql

@@ -0,0 +1 @@
+insert into dump_test values (1.0);

br/tests/lightning_routes_panic/data/test1.dump_test.002.sql

@@ -0,0 +1 @@
+insert into dump_test values (6.0);

br/tests/lightning_routes_panic/data/test1.dump_test.003.sql

@@ -0,0 +1 @@
+insert into dump_test values (36.0);

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'