index out of range in the TestGetMergeRegionSizeAndCount

[hawkingrei]

Bug Report

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1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

3. What did you see instead (Required)

2024/03/26 12:32:33 http: panic serving 127.0.0.1:54548: runtime error: index out of range [2] with length 2
goroutine 16 [running]:
net/http.(*conn).serve.func1()
	/opt/homebrew/Cellar/go/1.22.1/libexec/src/net/http/server.go:1898 +0xe4
panic({0x105cf1e00?, 0xc0002a13c8?})
	/opt/homebrew/Cellar/go/1.22.1/libexec/src/runtime/panic.go:770 +0x124
github.com/pingcap/tidb/br/pkg/conn.TestGetMergeRegionSizeAndCount.func1({0x105f20920, 0xc0001bbce0}, 0xc0007f5d40)
	/Users/weizhenwang/devel/opensource/tidb/br/pkg/conn/conn_test.go:416 +0x1f0
net/http.HandlerFunc.ServeHTTP(0xc00000fe18, {0x105f20920, 0xc0001bbce0}, 0xc0007f5d40)
	/opt/homebrew/Cellar/go/1.22.1/libexec/src/net/http/server.go:2166 +0x4c
net/http.serverHandler.ServeHTTP({0xc000e0d470?}, {0x105f20920, 0xc0001bbce0}, 0xc0007f5d40)
	/opt/homebrew/Cellar/go/1.22.1/libexec/src/net/http/server.go:3137 +0x29c
net/http.(*conn).serve(0xc000539d40, {0x105f33310, 0xc000e801e0})
	/opt/homebrew/Cellar/go/1.22.1/libexec/src/net/http/server.go:2039 +0xf2c
created by net/http.(*Server).Serve in goroutine 14
	/opt/homebrew/Cellar/go/1.22.1/libexec/src/net/http/server.go:3285 +0x678

4. What is your TiDB version? (Required)