Add special type for scanning of unused columns (V1)

[br3w0r]

The problem: at my job when we worked with custom enums there was a problem when a new custom enum wasn't yet added to a struct for scanning. It leaded to an error when SELECT * FROM ... was used:

scany: scan row into struct fields: can't scan into dest[<idx>]: unknown oid <oid> cannot be scanned into *interface {}

This problem occurs because the interface{} type obviously doesn't implement the sql.Scanner interface. So, I added a new type that does the job and replaced the interface{} that was used for scanning of columns which wouldn't be used.

[georgysavva]

Hi, thank you for this catch. Can I ask you to also add a test for this use case please?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.63%. Comparing base (5c09502) to head (2b8f25c).

Additional details and impacted files

@@            Coverage Diff             @@
##               v1     #132      +/-   ##
==========================================
- Coverage   82.81%   82.63%   -0.18%     
==========================================
  Files           5        5              
  Lines         512      432      -80     
==========================================
- Hits          424      357      -67     
+ Misses         73       60      -13     
  Partials       15       15              

Flag	Coverage Δ
unittests	82.63% <100.00%> (-0.18%)	⬇️

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[br3w0r]

@georgysavva done!

[georgysavva]

@br3w0r, thank you for your contribution. I will go ahead and release a new version with this fix.