fix: incorrect dim set when creating BM25 doc sparse array

[zhengbuqian]

[mergify[bot]]

@zhengbuqian Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.62%. Comparing base (5a23c80) to head (f432d3b). Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37717      +/-   ##
==========================================
- Coverage   80.67%   80.62%   -0.06%     
==========================================
  Files        1357     1357              
  Lines      190679   190938     +259     
==========================================
+ Hits       153835   153940     +105     
- Misses      31416    31571     +155     
+ Partials     5428     5427       -1     

Components	Coverage Δ
Client	61.25% <ø> (ø)
Core	68.58% <ø> (-0.36%)	:arrow_down:
Go	83.19% <100.00%> (+<0.01%)	:arrow_up:

Files with missing lines	Coverage Δ
internal/storage/stats.go	66.46% <100.00%> (ø)
internal/util/function/bm25_function.go	80.39% <100.00%> (+0.39%)	:arrow_up:

... and 38 files with indirect coverage changes

[aoiasd]

/lgtm

[czs007]

/approve

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[zhengbuqian]

issue: #35853