fix: full text search may produce dup results when search over multiple columns

[BubbleCal]

fix #3188

[github-actions]

ACTION NEEDED
Lance follows the Conventional Commits specification for release automation.

The PR title and description are used as the merge commit message. Please update your PR title and description to match the specification.

For details on the error please inspect the "PR Title Check" action.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 78.71%. Comparing base (dc9afbb) to head (d97469d).

Files with missing lines	Patch %	Lines
rust/lance/src/dataset/scanner.rs	73.33%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3189      +/-   ##
==========================================
+ Coverage   78.06%   78.71%   +0.64%     
==========================================
  Files         243      243              
  Lines       82661    82694      +33     
  Branches    82661    82694      +33     
==========================================
+ Hits        64529    65090     +561     
+ Misses      14932    14825     -107     
+ Partials     3200     2779     -421     

Flag	Coverage Δ
unittests	78.71% <75.00%> (+0.64%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[wjones127]

This fix looks good. The CI failure looks like it's an issue on main. I'll investigate that soon.