assign unique id to each logical plan node

[jiangzhe]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.08434% with 24 lines in your changes are missing coverage. Please review.

Project coverage is 70.99%. Comparing base (bbabfc2) to head (775ff90).

Files	Patch %	Lines
xngin-plan/src/explain.rs	40.00%	12 Missing ⚠️
xngin-plan/src/lgc/builder.rs	85.71%	4 Missing ⚠️
xngin-plan/src/lgc/op.rs	33.33%	2 Missing ⚠️
xngin-plan/src/lgc/reflect.rs	80.00%	2 Missing ⚠️
xngin-plan/src/rule/pred_move.rs	0.00%	2 Missing ⚠️
xngin-plan/src/rule/assign_id.rs	93.75%	1 Missing ⚠️
xngin-plan/src/rule/derived_unfold.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #136   +/-   ##
=======================================
  Coverage   70.99%   70.99%           
=======================================
  Files         124      126    +2     
  Lines       15795    15798    +3     
=======================================
+ Hits        11213    11216    +3     
  Misses       4582     4582           

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