refactor: split sink batch

[ngjaying]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.16667% with 35 lines in your changes are missing coverage. Please review.

Project coverage is 63.15%. Comparing base (bf3b679) to head (390979c).

Files	Patch %	Lines
internal/topo/node/batch_op.go	77.23%	22 Missing and 1 partial ⚠️
internal/topo/node/sink_node.go	75.00%	5 Missing and 1 partial ⚠️
internal/topo/planner/sink_planner.go	84.62%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2745      +/-   ##
==========================================
- Coverage   63.15%   63.15%   -0.01%     
==========================================
  Files         345      346       +1     
  Lines       39283    39312      +29     
==========================================
+ Hits        24809    24824      +15     
- Misses      12301    12315      +14     
  Partials     2173     2173              

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