fix: report error when hints not supported

[chasingegg]

issue: #38705
pr: #38717

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.03%. Comparing base (bca21bd) to head (65e6d6c).
Report is 6 commits behind head on 2.5.

Files with missing lines	Patch %	Lines
internal/core/src/query/PlanProto.cpp	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #38730      +/-   ##
==========================================
- Coverage   81.05%   81.03%   -0.02%     
==========================================
  Files        1381     1381              
  Lines      195110   195114       +4     
==========================================
- Hits       158137   158114      -23     
- Misses      31404    31422      +18     
- Partials     5569     5578       +9     

Components	Coverage Δ
Client	78.26% <ø> (ø)
Core	69.34% <57.14%> (+<0.01%)	⬆️
Go	83.01% <ø> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
internal/core/src/query/PlanProto.cpp	90.09% <57.14%> (-0.19%)	⬇️

... and 23 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chasingegg, czs007

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