lighning: add foreign key test

Signed-off-by: crazycs520 <[email protected]>

br/tests/lightning_foreign_key/data/fk-schema-create.sql

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+create database foreign_key;

br/tests/lightning_foreign_key/data/fk.child-schema.sql

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+create table child (id int key, pid int, constraint fk_1 foreign key (pid) references parent(id));

br/tests/lightning_foreign_key/data/fk.child.sql

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+insert into child values (1,1),(2,2),(3,3),(4,4);

br/tests/lightning_foreign_key/data/fk.parent-schema.sql

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+create table parent(id int key, a int);

br/tests/lightning_foreign_key/data/fk.parent.sql

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+insert into parent values (1,1),(2,2),(3,3),(4,4);

br/tests/lightning_foreign_key/run.sh

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+#!/bin/sh
+#
+# Copyright 2022 PingCAP, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Basic check for whether partitioned tables work.
+
+set -eu
+
+for BACKEND in tidb local; do
+    if [ "$BACKEND" = 'local' ]; then
+      check_cluster_version 4 0 0 'local backend' || continue
+    fi
+
+    run_sql 'DROP DATABASE IF EXISTS foreign_key;'
+
+    run_lightning --backend $BACKEND
+
+    run_sql 'SELECT count(1), sum(a) FROM foreign_key.parent;'
+    check_contains 'count(1): 4'
+    check_contains 'sum(a): 10'
+
+    run_sql 'SELECT count(1), sum(pid) FROM foreign_key.child;'
+    check_contains 'count(1): 4'
+    check_contains 'sum(pid): 10'
+done