tests: add integration2 for tools integration tests

tests/integrationtest2/README.md

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+# IntegrationTest
+
+IntegrationTest is a integration test command tool, also with some useful test cases for TiDB execute plan logic, we can run case via `run-tests.sh`.
+
+```
+Usage: ./run-tests.sh [options]
+
+    -h: Print this help message.
+
+    -s <tidb-server-path>: Use tidb-server in <tidb-server-path> for testing.
+                           eg. "./run-tests.sh -s ./integrationtest_tidb-server"
+
+    -b <y|Y|n|N>: "y" or "Y" for building test binaries [default "y" if this option is not specified].
+                  "n" or "N" for not to build.
+                  The building of tidb-server will be skiped if "-s <tidb-server-path>" is provided.
+
+    -r <test-name>|all: Run tests in file "t/<test-name>.test" and record result to file "r/<test-name>.result".
+                        "all" for running all tests and record their results.
+
+    -t <test-name>: Run tests in file "t/<test-name>.test".
+                    This option will be ignored if "-r <test-name>" is provided.
+                    Run all tests if this option is not provided.
+
+    -v <vendor-path>: Add <vendor-path> to $GOPATH.
+
+    -p <portgenerator-path>: Use port generator in <portgenerator-path> for generating port numbers.
+```
+
+## How it works
+
+IntegrationTest will read test case in `t/*.test`, and execute them in TiDB server with `s/*.json` stat, and compare integration result in `r/*.result`.
+
+For convenience, we can generate new `*.result` and `*.json` from execute by use `-r` parameter for `run-tests.sh`
+
+## Usage
+
+### Regression Execute Plan Modification
+
+After modify code and before commit, please run this command under TiDB root folder.
+
+```sh
+make dev
+```
+
+or
+
+```sh
+make integrationtest
+```
+
+It will identify execute plan change.
+
+### Generate New Result from Execute
+
+Add a new test file in `t/` folder, file name should ended with `.test`. Or add new test queries at the end of some files. Then run shell below, it will generate results based on last execution.
+
+```sh
+cd tests/integrationtest
+./run-tests.sh -r [casename]
+```
+
+## How to debug integration test
+
+### Visual Studio Code
+
+1. Add or create a configuration to `.vscode/launch.json`, an example is shown below. If you want to change some configurations, such as using `TiKV` to run integration tests or others, you can modify `pkg/config/config.toml.example`.
+
+```json
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug TiDB With Default Config",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileWorkspaceFolder}/cmd/tidb-server",
+            "args": ["--config=${fileWorkspaceFolder}/pkg/config/config.toml.example"]
+        }
+    ]
+}
+```
+
+2. To run `TiDB-Server`, you could bring up **Run and Debug** view, select the **Run and Debug** icon in the **Activity Bar** on the side of VS Code. You can also use shortcut **F5**.
+
+3. Use any mysql client application you like to run SQLs in integration test, the default port is `4000` and default user is `root` without password. Taking `mysql` as an example, you can use `mysql --comments --host 127.0.0.1 --port 4000 -u root` command to do this.
+
+### Goland
+
+You could follow <https://pingcap.github.io/tidb-dev-guide/get-started/setup-an-ide.html#run-or-debug> to run a `TiDB-Server` with or without `TiKV`. Then use any mysql client application you like to run SQLs.

tests/integrationtest2/config.toml

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+# Copyright 2021 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.
+
+lease = "0"
+host = "127.0.0.1"
+new_collations_enabled_on_first_bootstrap = true
+enable-table-lock = true
+
+[status]
+status-host = "127.0.0.1"
+
+[performance]
+stats-lease = "0"
+
+[tikv-client.async-commit]
+safe-window = 0
+allowed-clock-drift = 0
+
+[experimental]
+enable-new-charset = true
+allow-expression-index = true

tests/integrationtest2/download_integration_test_binaries.sh

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+#! /usr/bin/env bash
+
+# help
+# download some third party tools for br&lightning integration test
+# example: ./download_integration_test_binaries.sh master
+
+
+set -o errexit
+set -o pipefail
+
+
+# Specify which branch to be utilized for executing the test, which is
+# exclusively accessible when obtaining binaries from
+# http://fileserver.pingcap.net.
+branch=${1:-master}
+file_server_url=${2:-http://fileserver.pingcap.net}
+
+tikv_sha1_url="${file_server_url}/download/refs/pingcap/tikv/${branch}/sha1"
+pd_sha1_url="${file_server_url}/download/refs/pingcap/pd/${branch}/sha1"
+tiflash_sha1_url="${file_server_url}/download/refs/pingcap/tiflash/${branch}/sha1"
+ticdc_sha1_url="${file_server_url}/download/refs/pingcap/ticdc/${branch}/sha1"
+
+pd_sha1=$(curl "$pd_sha1_url")
+tikv_sha1=$(curl "$tikv_sha1_url")
+tiflash_sha1=$(curl "$tiflash_sha1_url")
+ticdc_sha1=$(curl "$ticdc_sha1_url")
+
+# download pd / tikv / tiflash binary build from tibuid multibranch pipeline
+pd_download_url="${file_server_url}/download/builds/pingcap/pd/${pd_sha1}/centos7/pd-server.tar.gz"
+tikv_download_url="${file_server_url}/download/builds/pingcap/tikv/${tikv_sha1}/centos7/tikv-server.tar.gz"
+tiflash_download_url="${file_server_url}/download/builds/pingcap/tiflash/${branch}/${tiflash_sha1}/centos7/tiflash.tar.gz"
+ticdc_download_url="${file_server_url}/download/builds/pingcap/ticdc/${ticdc_sha1}/centos7/ticdc-linux-amd64.tar.gz"
+
+set -o nounset
+
+# See https://misc.flogisoft.com/bash/tip_colors_and_formatting.
+color-green() { # Green
+	echo -e "\x1B[1;32m${*}\x1B[0m"
+}
+
+function download() {
+    local url=$1
+    local file_name=$2
+    local file_path=$3
+    if [[ -f "${file_path}" ]]; then
+        echo "file ${file_name} already exists, skip download"
+        return
+    fi
+    echo "download ${file_name} from ${url}"
+    wget --no-verbose --retry-connrefused --waitretry=1 -t 3 -O "${file_path}" "${url}"
+}
+
+function main() { 
+    rm -rf third_bin
+    rm -rf tmp
+    mkdir third_bin
+    mkdir tmp
+
+    #PD server
+    download "$pd_download_url" "pd-server.tar.gz" "tmp/pd-server.tar.gz"
+    # tar -xzf tmp/pd-server.tar.gz -C third_bin --wildcards 'bin/*'
+    tar -xzf tmp/pd-server.tar.gz -C third_bin
+    mv third_bin/bin/* third_bin/
+
+    #TiKV server
+    download "$tikv_download_url" "tikv-server.tar.gz" "tmp/tikv-server.tar.gz"
+    # tar -xzf tmp/tikv-server.tar.gz -C third_bin --wildcards 'bin/*'
+    tar -xzf tmp/tikv-server.tar.gz -C third_bin
+    mv third_bin/bin/* third_bin/
+
+    #TiFlash
+    download "$tiflash_download_url" "tiflash.tar.gz" "tmp/tiflash.tar.gz"
+    tar -xzf tmp/tiflash.tar.gz -C third_bin
+    mv third_bin/tiflash third_bin/_tiflash
+    mv third_bin/_tiflash/* third_bin && rm -rf third_bin/_tiflash
+
+    #TiCDC
+    download "$ticdc_download_url" "ticdc-linux-amd64.tar.gz" "tmp/ticdc-linux-amd64.tar.gz"
+    # tar -xzf tmp/ticdc-linux-amd64.tar.gz -C third_bin --wildcards '*/bin/*'
+    tar -xzf tmp/ticdc-linux-amd64.tar.gz -C third_bin
+    mv third_bin/ticdc-linux-amd64/bin/* third_bin/
+
+    chmod +x third_bin/*
+    rm -rf tmp
+    # rm -rf third_bin/bin
+    ls -alh third_bin/
+}
+
+main "$@"
+
+color-green "Download SUCCESS"

tests/integrationtest2/r/br_integration.result

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+CREATE TABLE t1 (a INT PRIMARY KEY NONCLUSTERED AUTO_INCREMENT, b INT) AUTO_ID_CACHE = 100;
+INSERT INTO t1 (b) VALUES (1), (2), (3);
+SHOW TABLE t1 NEXT_ROW_ID;
+DB_NAME	TABLE_NAME	COLUMN_NAME	NEXT_GLOBAL_ROW_ID	ID_TYPE
+br_integration	t1	_tidb_rowid	101	_TIDB_ROWID
+br_integration	t1	_tidb_rowid	1	AUTO_INCREMENT
+SHOW TABLE tt1 NEXT_ROW_ID;
+DB_NAME	TABLE_NAME	COLUMN_NAME	NEXT_GLOBAL_ROW_ID	ID_TYPE
+br_integration	tt1	_tidb_rowid	1	_TIDB_ROWID
+br_integration	tt1	_tidb_rowid	1	AUTO_INCREMENT