dump: speedup dump for SQL and tikv

[davies]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 68.03797% with 101 lines in your changes are missing coverage. Please review.

Project coverage is 55.65%. Comparing base (4026264) to head (a780e25).

Files	Patch %	Lines
pkg/meta/sql.go	68.66%	37 Missing and 10 partials ⚠️
pkg/meta/tkv.go	70.73%	25 Missing and 11 partials ⚠️
pkg/meta/redis.go	63.63%	11 Missing and 1 partial ⚠️
pkg/meta/dump.go	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4501      +/-   ##
==========================================
+ Coverage   55.58%   55.65%   +0.07%     
==========================================
  Files         157      157              
  Lines       42337    42515     +178     
==========================================
+ Hits        23531    23663     +132     
- Misses      16176    16218      +42     
- Partials     2630     2634       +4     

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