fix: disable field pruning in last non null mode

[evenyag]

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Refer to a related PR or issue link (optional)

fixes #4736

What's changed and what's your intention?

This PR disables pruning SSTs by fields if the merge mode is last_non_null. Pruning rows by fields before the merge phase may remove some useful rows, like #4736

This may have a negative impact on query performance in last_non_null mode. We can alleviate this by checking whether SSTs and memtables have overlapping ranges and only remove field filters if they are overlapping. However, we need to refactor the scanner to postpone pruning.

I'll address this later.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 84.63%. Comparing base (befb6d8) to head (48b3565).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4740      +/-   ##
==========================================
- Coverage   84.89%   84.63%   -0.27%     
==========================================
  Files        1116     1117       +1     
  Lines      201328   201519     +191     
==========================================
- Hits       170922   170551     -371     
- Misses      30406    30968     +562     

[v0y4g3r]

LGTM