enhance: support null in text match index

[smellthemoon]

#37508

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[codecov]

Codecov Report

Attention: Patch coverage is 43.58974% with 44 lines in your changes missing coverage. Please review.

Project coverage is 80.56%. Comparing base (1b6edd0) to head (3875510).
Report is 21 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/core/src/index/TextMatchIndex.cpp	34.04%	31 Missing ⚠️
internal/core/src/exec/expression/Expr.h	63.15%	7 Missing ⚠️
...rnal/core/src/segcore/ChunkedSegmentSealedImpl.cpp	0.00%	4 Missing ⚠️
internal/core/src/segcore/SegmentSealedImpl.cpp	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37517      +/-   ##
==========================================
+ Coverage   80.55%   80.56%   +0.01%     
==========================================
  Files        1356     1356              
  Lines      190059   190122      +63     
==========================================
+ Hits       153102   153172      +70     
- Misses      31526    31536      +10     
+ Partials     5431     5414      -17     

Components	Coverage Δ
Client	60.27% <ø> (ø)
Core	68.06% <43.58%> (-0.07%)	⬇️
Go	83.22% <ø> (+0.02%)	⬆️

Files with missing lines	Coverage Δ
internal/core/src/segcore/SegmentGrowingImpl.cpp	77.60% <100.00%> (+0.11%)	⬆️
internal/core/src/segcore/SegmentGrowingImpl.h	70.00% <ø> (ø)
internal/core/src/segcore/SegmentSealedImpl.cpp	85.94% <50.00%> (+0.01%)	⬆️
...rnal/core/src/segcore/ChunkedSegmentSealedImpl.cpp	14.85% <0.00%> (-0.02%)	⬇️
internal/core/src/exec/expression/Expr.h	74.02% <63.15%> (-1.06%)	⬇️
internal/core/src/index/TextMatchIndex.cpp	41.66% <34.04%> (-3.87%)	⬇️

... and 27 files with indirect coverage changes

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[sunby]

/lgtm

[congqixia]

/approve

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