test(integration): add pg kvbackend

[CookiePieWw]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#5208

What's changed and what's your intention?

Add pg kvbackend for integration test. Not quite sure if it's alright to do like this.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[sunng87]

This will double our runner time and CI cost. We need figure out a way to run this effectively.

[CookiePieWw]

Not double actually, but still quite slow

Besides, I doubt if the pg kvbackend is actually running, I didn't see the info logs that tells me which backend it's using...

If we'd like to run integration test over pg kvbackend, the cost seems unevitable. I wonder if there's a method that we can run it when something related to pg_kvbackend features have been changed.

[sunng87]

Can we move this to a separated task that uses free runner (ubuntu-latest) to see if it's capable to run this?

[CookiePieWw]

Quite reasonable for me. I'll have a try.

[sunng87]

Also remember to change the command from cargo test integration to cd tests-integration && cargo nextest run. This will reduce test binaries required to compile and link.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.90%. Comparing base (78d0fa7) to head (5ea8d6d).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5331      +/-   ##
==========================================
- Coverage   84.14%   83.90%   -0.25%     
==========================================
  Files        1181     1181              
  Lines      220905   220905              
==========================================
- Hits       185882   185351     -531     
- Misses      35023    35554     +531     

[CookiePieWw]

Some of the integration test do not require a distributed databases then we don't need a pg kvbackend for it. Since sqlness test for pg kvbackend has been added, we can hold this for now to see if there's other solution.