Fix some potential performance defects (#445)

[yhmo]

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[codecov]

Codecov Report

❌ Patch coverage is 76.47059% with 8 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (2.6@f0a7362). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/impl/utils/FP16.cpp	50.00%	4 Missing ⚠️
src/impl/utils/DqlUtils.cpp	84.21%	3 Missing ⚠️
src/impl/MilvusClientV2Impl.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             2.6     #447   +/-   ##
======================================
  Coverage       ?   46.06%           
======================================
  Files          ?      235           
  Lines          ?    12381           
  Branches       ?     1241           
======================================
  Hits           ?     5703           
  Misses         ?     6584           
  Partials       ?       94           

Files with missing lines	Coverage Δ
src/impl/types/FieldData.cpp	69.28% <100.00%> (ø)
src/impl/utils/CompareUtils.cpp	83.15% <100.00%> (ø)
src/include/milvus/types/ConnectParam.h	100.00% <ø> (ø)
src/impl/MilvusClientV2Impl.cpp	0.00% <0.00%> (ø)
src/impl/utils/DqlUtils.cpp	66.41% <84.21%> (ø)
src/impl/utils/FP16.cpp	78.12% <50.00%> (ø)

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