Rework ResultSetDescriptor

[andyfengHKU]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (ad3741e) 91.73% compared to head (6a03737) 91.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1561      +/-   ##
==========================================
- Coverage   91.73%   91.72%   -0.01%     
==========================================
  Files         698      698              
  Lines       25138    25128      -10     
==========================================
- Hits        23060    23049      -11     
- Misses       2078     2079       +1     

Impacted Files	Coverage Δ
src/include/processor/mapper/plan_mapper.h	100.00% <ø> (ø)
src/include/processor/result/result_set.h	100.00% <ø> (ø)
src/processor/mapper/expression_mapper.cpp	100.00% <ø> (ø)
src/processor/mapper/map_distinct.cpp	100.00% <ø> (ø)
...c/include/processor/result/result_set_descriptor.h	100.00% <100.00%> (ø)
src/processor/mapper/map_accumulate.cpp	55.00% <100.00%> (ø)
src/processor/mapper/map_aggregate.cpp	96.49% <100.00%> (ø)
src/processor/mapper/map_cross_product.cpp	100.00% <100.00%> (ø)
src/processor/mapper/map_extend.cpp	94.78% <100.00%> (ø)
src/processor/mapper/map_hash_join.cpp	100.00% <100.00%> (ø)
... and 7 more

... and 2 files with indirect coverage changes

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