[close #716] Fix pair

[shiyuhang0]

What problem does this PR solve?

Issue Number: close #716

Problem Description: TBD

What is changed and how does it work?

override equals and hashcode

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has methods of interface change
• Has persistent data change
• No code

Check List for Tests

This PR has been tested by at least one of the following methods:

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Possible performance regression, WHY: TBD
• Increased code complexity, WHY: TBD
• Breaking backward compatibility, WHY: TBD
• NO side effects

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note
• NO related changes

[codecov]

Codecov Report

Base: 38.09% // Head: 37.89% // Decreases project coverage by -0.21% ⚠️

Coverage data is based on head (c0cb214) compared to base (dda1029).
Patch coverage: 28.57% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #724      +/-   ##
============================================
- Coverage     38.09%   37.89%   -0.21%     
+ Complexity     1613     1605       -8     
============================================
  Files           278      278              
  Lines         17462    17469       +7     
  Branches       1984     1986       +2     
============================================
- Hits           6653     6620      -33     
- Misses        10154    10187      +33     
- Partials        655      662       +7     

Impacted Files	Coverage Δ
src/main/java/org/tikv/common/util/Pair.java	53.84% <28.57%> (-29.49%)	⬇️
src/main/java/org/tikv/common/pd/PDError.java	0.00% <0.00%> (-30.31%)	⬇️
...java/org/tikv/common/operation/PDErrorHandler.java	40.00% <0.00%> (-20.00%)	⬇️
src/main/java/org/tikv/common/region/TiStore.java	56.41% <0.00%> (-5.13%)	⬇️
...va/org/tikv/common/region/StoreHealthyChecker.java	69.62% <0.00%> (-3.80%)	⬇️
src/main/java/io/grpc/stub/ClientCalls.java	46.20% <0.00%> (-2.32%)	⬇️
...ty/handler/codec/http2/Http2ConnectionHandler.java	45.96% <0.00%> (-0.98%)	⬇️
src/main/java/io/grpc/internal/ClientCallImpl.java	56.65% <0.00%> (-0.73%)	⬇️
src/main/java/org/tikv/common/PDClient.java	58.62% <0.00%> (-0.24%)	⬇️
src/main/java/org/tikv/txn/TxnExpireTime.java	73.68% <0.00%> (+10.52%)	⬆️

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[ti-srebot]

@zhangyangyu, Thanks for your review. The bot only counts LGTMs from Reviewers and higher roles, but you're still welcome to leave your comments. get siglist: dial tcp 172.16.4.167:34000: connect: no route to host

[ti-srebot]

@Daemonxiao, Thanks for your review. The bot only counts LGTMs from Reviewers and higher roles, but you're still welcome to leave your comments. get siglist: dial tcp 172.16.4.167:34000: connect: no route to host

[ti-srebot]

@xuanyu66, Thanks for your review. The bot only counts LGTMs from Reviewers and higher roles, but you're still welcome to leave your comments. get siglist: dial tcp 172.16.4.167:34000: connect: no route to host

[pingyu]

LGTM~

[ti-srebot]

@pingyu, Thanks for your review. The bot only counts LGTMs from Reviewers and higher roles, but you're still welcome to leave your comments. get siglist: dial tcp 172.16.4.167:34000: connect: no route to host

[wuhuizuo]

/cherry-pick release-3.3

[ti-chi-bot]

@wuhuizuo: new pull request created to branch release-3.3: #727.

Details

In response to this:

/cherry-pick release-3.3

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