Feature/driver-dm fix something is invalid in dm

[zhonghuaxunGM]

1. fix core.hasfield error index out of range
2. fix GroupConcat is invalid in dm

[codecov-commenter]

Codecov Report

Base: 76.58% // Head: 76.55% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (2f07f87) compared to base (66aa0c7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2158      +/-   ##
==========================================
- Coverage   76.58%   76.55%   -0.03%     
==========================================
  Files         577      579       +2     
  Lines       47899    47986      +87     
==========================================
+ Hits        36683    36737      +54     
- Misses       9222     9249      +27     
- Partials     1994     2000       +6     

Flag	Coverage Δ
go-1.15-386	76.53% <100.00%> (+0.01%)	⬆️
go-1.15-amd64	76.48% <100.00%> (-0.02%)	⬇️
go-1.16-386	76.52% <100.00%> (?)
go-1.16-amd64	76.57% <100.00%> (+0.04%)	⬆️
go-1.17-386	76.52% <100.00%> (-0.01%)	⬇️
go-1.17-amd64	76.53% <100.00%> (+<0.01%)	⬆️
go-1.18-386	76.50% <100.00%> (?)
go-1.18-amd64	76.49% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
contrib/drivers/dm/dm.go	73.68% <100.00%> (+0.09%)	⬆️
contrib/config/kubecm/kubecm_kube.go	100.00% <0.00%> (ø)
contrib/config/kubecm/kubecm.go	41.53% <0.00%> (ø)
os/gcfg/gcfg.go	65.34% <0.00%> (+1.98%)	⬆️
os/gcron/gcron_schedule_fix.go	100.00% <0.00%> (+12.50%)	⬆️

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