Fix text error and test reading tsfile from iotdb.

[ColinLeeo]

fix TEXT null.

tmp code.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.87097% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.90%. Comparing base (4f25d22) to head (8ead48c).

Files with missing lines	Patch %	Lines
cpp/src/reader/aligned_chunk_reader.cc	77.27%	1 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #666      +/-   ##
===========================================
+ Coverage    61.84%   61.90%   +0.06%     
===========================================
  Files          709      709              
  Lines        40112    40121       +9     
  Branches      5642     5646       +4     
===========================================
+ Hits         24806    24837      +31     
+ Misses       14603    14577      -26     
- Partials       703      707       +4     

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