Refactor scan rel table

[andyfengHKU]

No description provided.

[codecov]

Codecov Report

Patch coverage: 98.49% and no project coverage change.

Comparison is base (3c20011) 91.42% compared to head (05195ed) 91.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1749   +/-   ##
=======================================
  Coverage   91.42%   91.43%           
=======================================
  Files         766      766           
  Lines       27507    27509    +2     
=======================================
+ Hits        25149    25153    +4     
+ Misses       2358     2356    -2     

Impacted Files	Coverage Δ
src/processor/mapper/map_extend.cpp	96.29% <97.14%> (-0.85%)	⬇️
...rocessor/operator/scan/generic_scan_rel_tables.cpp	96.49% <97.67%> (+0.49%)	⬆️
.../processor/operator/scan/generic_scan_rel_tables.h	100.00% <100.00%> (ø)
...c/include/processor/operator/scan/scan_rel_table.h	100.00% <100.00%> (ø)
...e/processor/operator/scan/scan_rel_table_columns.h	100.00% <100.00%> (ø)
...ude/processor/operator/scan/scan_rel_table_lists.h	100.00% <100.00%> (ø)
src/processor/operator/scan/scan_rel_table.cpp	100.00% <100.00%> (ø)
...processor/operator/scan/scan_rel_table_columns.cpp	100.00% <100.00%> (ø)
...c/processor/operator/scan/scan_rel_table_lists.cpp	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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