Default values

[saikiriti93]

Default values for MV tables. Fixes #24

PS: My C++ is pretty bad! So please feel free to suggest improvements.

[codecov-io]

Codecov Report

Merging #28 into schema_change will increase coverage by 0.05%.
The diff coverage is 96.15%.

@@                Coverage Diff                @@
##           schema_change      #28      +/-   ##
=================================================
+ Coverage          88.11%   88.17%   +0.05%     
=================================================
  Files                190      190              
  Lines               7242     7287      +45     
=================================================
+ Hits                6381     6425      +44     
- Misses               861      862       +1

Impacted Files	Coverage Δ
src/storage/projected_row.cpp	100% <ø> (ø)	⬆️
src/include/storage/sql_table.h	96.22% <ø> (ø)	⬆️
src/include/storage/storage_defs.h	94.44% <ø> (ø)	⬆️
src/storage/data_table.cpp	96.66% <ø> (-0.03%)	⬇️
src/storage/sql_table.cpp	95.97% <100%> (+1.01%)	⬆️
src/include/catalog/schema.h	96.66% <84.61%> (-3.34%)	⬇️
src/transaction/transaction_manager.cpp	95.27% <0%> (+0.78%)	⬆️

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[jrolli]

The code to apply default values looks clean, but I think the code applies default values in cases where it shouldn't. A test suite just for default values would help keep us on track.