Added flag about default value in TableColumn

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.25%. Comparing base (c91ad03) to head (fc87a81).

Files with missing lines	Patch %	Lines
...src/main/java/tech/ydb/table/impl/BaseSession.java	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #495      +/-   ##
============================================
+ Coverage     58.15%   58.25%   +0.10%     
- Complexity     2183     2191       +8     
============================================
  Files           325      325              
  Lines         13216    13222       +6     
  Branches       1330     1331       +1     
============================================
+ Hits           7686     7703      +17     
+ Misses         4907     4895      -12     
- Partials        623      624       +1     

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