support expr for count

[shanghaikid]

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[sre-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (99f9ece) 93.77% compared to head (4eab1e9) 96.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #274      +/-   ##
==========================================
+ Coverage   93.77%   96.84%   +3.06%     
==========================================
  Files          38       39       +1     
  Lines        1831     1901      +70     
  Branches      458      460       +2     
==========================================
+ Hits         1717     1841     +124     
+ Misses        109       55      -54     
  Partials        5        5              

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