Fix PKs2Expr

[xwjdsh]

Close #429

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.49%. Comparing base (53227fa) to head (e147ca0).
Report is 217 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #430   +/-   ##
=======================================
  Coverage   87.49%   87.49%           
=======================================
  Files          30       30           
  Lines        2815     2815           
=======================================
  Hits         2463     2463           
  Misses        267      267           
  Partials       85       85           

Files with missing lines	Coverage Δ
client/client_grpc_data.go	72.48% <100.00%> (ø)