[close #716] Fix pair (#724)

[ti-chi-bot]

This is an automated cherry-pick of #724

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

❗ No coverage uploaded for pull request base (release-3.3@c85eeae). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff               @@
##             release-3.3     #727   +/-   ##
==============================================
  Coverage               ?   37.88%           
  Complexity             ?     1606           
==============================================
  Files                  ?      278           
  Lines                  ?    17469           
  Branches               ?     1986           
==============================================
  Hits                   ?     6619           
  Misses                 ?    10190           
  Partials               ?      660           

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[ti-srebot]

@shiyuhang0, 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