fix: make GetIsSparse const

[zhengbuqian]

minor fix
/kind improvement

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.29%. Comparing base (3c46f4c) to head (f321236).
Report is 80 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #627       +/-   ##
=========================================
+ Coverage      0   70.29%   +70.29%     
=========================================
  Files         0       67       +67     
  Lines         0     4719     +4719     
=========================================
+ Hits          0     3317     +3317     
- Misses        0     1402     +1402     

see 67 files with indirect coverage changes

[cydrain]

/lgtm

[liliu-z]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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