Re-organize projection planner

[andyfengHKU]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04% ⚠️

Comparison is base (b03de04) 89.71% compared to head (af0760a) 89.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1898      +/-   ##
==========================================
- Coverage   89.71%   89.67%   -0.04%     
==========================================
  Files         854      859       +5     
  Lines       30976    30975       -1     
==========================================
- Hits        27789    27777      -12     
- Misses       3187     3198      +11     

Files Changed	Coverage Δ
src/include/planner/query_planner.h	100.00% <100.00%> (ø)
src/planner/join_order/append_extend.cpp	95.28% <100.00%> (ø)
src/planner/plan/append_aggregate.cpp	100.00% <100.00%> (ø)
src/planner/plan/append_limit.cpp	100.00% <100.00%> (ø)
src/planner/plan/append_multiplicity_reducer.cpp	100.00% <100.00%> (ø)
src/planner/plan/append_order_by.cpp	100.00% <100.00%> (ø)
src/planner/plan/append_projection.cpp	100.00% <100.00%> (ø)
src/planner/plan/append_skip.cpp	100.00% <100.00%> (ø)
src/planner/plan/plan_projection.cpp	100.00% <100.00%> (ø)
src/planner/query_planner.cpp	93.52% <100.00%> (ø)

... and 4 files with indirect coverage changes

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