infoschema_v2: remove schemaTableInfos for foreign key (#55624)

close #55623

Author: fzzf678

pkg/ddl/foreign_key.go

@@ -589,15 +589,15 @@ func checkDatabaseHasForeignKeyReferred(ctx context.Context, is infoschema.InfoS
 	if !fkCheck {
 		return nil
 	}
-	tables, err := is.SchemaTableInfos(ctx, schema)
+	tableNameInfos, err := is.SchemaSimpleTableInfos(ctx, schema)
 	if err != nil {
 		return errors.Trace(err)
 	}
-	tableNames := make([]ast.Ident, len(tables))
-	for i := range tables {
-		tableNames[i] = ast.Ident{Schema: schema, Name: tables[i].Name}
+	tableNames := make([]ast.Ident, len(tableNameInfos))
+	for i := range tableNameInfos {
+		tableNames[i] = ast.Ident{Schema: schema, Name: tableNameInfos[i].Name}
 	}
-	for _, tbl := range tables {
+	for _, tbl := range tableNameInfos {
 		if referredFK := checkTableHasForeignKeyReferred(is, schema.L, tbl.Name.L, tableNames, fkCheck); referredFK != nil {
 			return errors.Trace(dbterror.ErrForeignKeyCannotDropParent.GenWithStackByArgs(tbl.Name, referredFK.ChildFKName, referredFK.ChildTable))
 		}

tests/integrationtest/r/ddl/foreign_key.result

@@ -206,4 +206,21 @@ select * from t2;
 id	b
 2	2
 admin check table t1,t2;
+create database test_db_1;
+create database test_db_2;
+create database test_db_3;
+use test_db_1;
+create table t1 (id int primary key);
+use test_db_2;
+create table t2 (id int primary key, b int, foreign key (b) references test_db_1.t1(id));
+use test_db_3;
+create table t3 (id int primary key);
+drop table test_db_1.t1;
+Error 3730 (HY000): Cannot drop table 't1' referenced by a foreign key constraint 'fk_1' on table 't2'.
+drop database test_db_1;
+Error 3730 (HY000): Cannot drop table 't1' referenced by a foreign key constraint 'fk_1' on table 't2'.
+drop table test_db_3.t3;
+drop database test_db_3;
+drop database test_db_2;
+drop database test_db_1;
 set @@foreign_key_checks=default;

tests/integrationtest/t/ddl/foreign_key.test

@@ -213,4 +213,24 @@ select * from t1;
 select * from t2;
 admin check table t1,t2;
 
+# TestCheckFKDatabaseRefWithSchemaSimpleTableInfos
+create database test_db_1;
+create database test_db_2;
+create database test_db_3;
+use test_db_1;
+create table t1 (id int primary key);
+use test_db_2;
+create table t2 (id int primary key, b int, foreign key (b) references test_db_1.t1(id));
+use test_db_3;
+create table t3 (id int primary key);
+-- error 3730
+drop table test_db_1.t1;
+-- error 3730
+drop database test_db_1;
+drop table test_db_3.t3;
+drop database test_db_3;
+## clean up
+drop database test_db_2;
+drop database test_db_1;
+
 set @@foreign_key_checks=default;