Add NOVALUES support to HSCAN

[Exzrgs]

Hi, I resolved #501
I added NOVALUES block.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.58%. Comparing base (236216b) to head (d1dda33).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #503   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files          80       80           
  Lines       33090    33102   +12     
=======================================
+ Hits        31628    31640   +12     
  Misses       1261     1261           
  Partials      201      201           

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[rueian]

Hi @Exzrgs, thanks! Please also run go generate

[Exzrgs]

@rueian
Sorry, I've run the command in other directory by mistake!
I run the command in the right place and push the commit!

[rueian]

Hi @Exzrgs, thank you for your contribution!