Removed heap memory allocation for scan/select header mangling

[yashNaN]

No description provided.

[codecov-io]

Codecov Report

Merging #16 into schema_change will decrease coverage by 0.02%.
The diff coverage is 100%.

@@                Coverage Diff                @@
##           schema_change      #16      +/-   ##
=================================================
- Coverage          90.25%   90.22%   -0.03%     
=================================================
  Files                 82       82              
  Lines               3508     3499       -9     
=================================================
- Hits                3166     3157       -9     
  Misses               342      342

Impacted Files	Coverage Δ
src/include/storage/projected_row.h	100% <ø> (ø)	⬆️
src/include/storage/sql_table.h	100% <ø> (ø)	⬆️
src/include/storage/projected_columns.h	100% <ø> (ø)	⬆️
src/storage/sql_table.cpp	85.88% <100%> (-0.41%)	⬇️

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[yangjuns]

LGTM