impl(bigtable): cancel refresh_timer_ in QueryPlan destructor

[scotthart]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @scotthart, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a destructor for the QueryPlan class. This change is crucial for resource management, as it ensures that any active refresh_timer_ associated with a QueryPlan instance is properly canceled upon the object's destruction. This prevents potential issues such as resource leaks or attempts to access deallocated memory if the timer were to fire after the QueryPlan object has been destroyed.

Highlights

• Destructor Implementation: Implemented the QueryPlan destructor to ensure proper cleanup of the refresh_timer_.
• Timer Cancellation: Added logic to cancel the refresh_timer_ if it is valid when a QueryPlan object is destroyed, preventing potential resource leaks or dangling operations.

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[gemini-code-assist]

Code Review

This pull request adds a destructor to QueryPlan to cancel the refresh timer when the object is destroyed. This is a good practice to ensure timely cleanup of resources. The implementation looks correct and thread-safe. I approve these changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.96%. Comparing base (435056d) to head (18a69c2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15755      +/-   ##
==========================================
- Coverage   92.96%   92.96%   -0.01%     
==========================================
  Files        2448     2448              
  Lines      226254   226257       +3     
==========================================
  Hits       210336   210336              
- Misses      15918    15921       +3     

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