Problem: redundant copy in check validate (back port: #1498)

[mmsqe]

free key

update doc

cleanup

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 36.53%. Comparing base (ed8a89e) to head (a168317).

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/v1.2.x    #1499      +/-   ##
==================================================
+ Coverage           36.52%   36.53%   +0.01%     
==================================================
  Files                 129      129              
  Lines                9607     9609       +2     
==================================================
+ Hits                 3509     3511       +2     
  Misses               5721     5721              
  Partials              377      377              

Files	Coverage Δ
versiondb/tsrocksdb/iterator.go	73.68% <85.71%> (+0.71%)	⬆️