ci(bigtable): update PartialResultSetSource to handle Cord usage

[mpeddada1]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @mpeddada1, 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 enhances the Bigtable client library's PartialResultSetSource to correctly handle absl::Cord types, specifically for the resume_token field. It achieves this by introducing a new, publicly accessible AsString utility function that facilitates the conversion of absl::Cord instances to std::string, thereby ensuring robust and compatible data processing within the client.

Highlights

• Cord Handling Utility: Introduced a new AsString utility function that can convert both std::string and absl::Cord types into std::string, ensuring consistent string representation.
• PartialResultSetSource Update: Modified the PartialResultSetSource to utilize the new AsString utility when processing the resume_token, explicitly converting it to a std::string.
• API Visibility: The AsString utility functions were moved out of an anonymous namespace in value.cc and their declarations were added to value.h, making them publicly accessible for use across the Bigtable client library.

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[gemini-code-assist]

Code Review

This pull request updates the PartialResultSetSource to handle absl::Cord usage by introducing an AsString helper function to convert absl::Cord to std::string when necessary. This ensures that the resume_token is correctly processed, regardless of whether it's stored as a std::string or an absl::Cord internally. The changes also include adding necessary header files and adjusting namespace usage.

[gemini-code-assist]

These function declarations are missing the inline keyword. According to the Google C++ Style Guide¹, small, frequently used functions should be declared inline to potentially improve performance.

inline std::string AsString(T const& s);

inline template <typename T, typename std::enable_if<std::is_same<T, std::string>::value>::type*> 
inline std::string AsString(T&& s);

inline template <typename T, typename std::enable_if<std::is_same<T, absl::Cord>::value>::type*> 
inline std::string AsString(T const& s);

inline template <typename T, typename std::enable_if<std::is_same<T, absl::Cord>::value>::type*> 
inline std::string AsString(T&& s);

Style Guide References

Footnotes

1. This repository mostly follows the Google C++ style guide found at https://google.github.io/styleguide/cppguide.html. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.10%. Comparing base (a5d8a1d) to head (6f49166).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15645      +/-   ##
==========================================
- Coverage   93.11%   93.10%   -0.01%     
==========================================
  Files        2433     2433              
  Lines      223720   223810      +90     
==========================================
+ Hits       208312   208387      +75     
- Misses      15408    15423      +15     

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