executor: fix HashJoinExec panic of closed channel (#38576)

[ti-chi-bot]

This is an automated cherry-pick of #38576

What problem does this PR solve?

Issue Number: close #37932

Problem Summary:

What is changed and how it works?

Apply will Open and Close an operator multiple times. The HashJoin below Apply returns an error in line 171 during Open, thus e.closeCh is not re-initialized, and the e.closeCh be closed in HashJoin.Close is an already closed channel in the last round.
To solve it, we set e.closeCh to nil in the Close function.

Check List

Tests

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

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• LittleFall
• XuHuaiyu

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[Qiaolin-Yu]

/run-all-tests

[Qiaolin-Yu]

/run-all-tests

[Qiaolin-Yu]

/cc @XuHuaiyu

[XuHuaiyu]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6a92ad4