Fix bug of bulkinsert for dynamic field

[yhmo]

#23389

[codecov]

Codecov Report

Merging #24568 (1977d67) into 2.2.0 (3fb9334) will decrease coverage by 0.02%.
The diff coverage is 87.87%.

@@            Coverage Diff             @@
##            2.2.0   #24568      +/-   ##
==========================================
- Coverage   80.90%   80.88%   -0.02%     
==========================================
  Files         759      759              
  Lines      106450   106454       +4     
==========================================
- Hits        86125    86110      -15     
- Misses      17019    17034      +15     
- Partials     3306     3310       +4     

Impacted Files	Coverage Δ
internal/util/importutil/import_util.go	95.15% <84.00%> (-0.86%)	⬇️
internal/util/importutil/numpy_parser.go	92.82% <100.00%> (+0.97%)	⬆️

... and 12 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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