refactor(codegen): null safe for struct ir builder

[aceforeverd]

fixes #926

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (6fe2a30) 39.13% compared to head (0583dff) 75.31%.

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #3547       +/-   ##
=============================================
+ Coverage     39.13%   75.31%   +36.18%     
  Complexity      587      587               
=============================================
  Files           188      718      +530     
  Lines         11093   129779   +118686     
  Branches       1280     1280               
=============================================
+ Hits           4341    97745    +93404     
- Misses         6466    31748    +25282     
  Partials        286      286               

Files	Coverage Δ
hybridse/src/codegen/date_ir_builder.cc	67.46% <ø> (ø)
hybridse/src/codegen/expr_ir_builder.cc	79.97% <100.00%> (ø)
hybridse/src/codegen/native_value.h	100.00% <ø> (ø)
hybridse/src/codegen/string_ir_builder.cc	84.57% <ø> (ø)
hybridse/src/codegen/timestamp_ir_builder.cc	70.81% <100.00%> (ø)
hybridse/src/codegen/type_ir_builder.h	100.00% <ø> (ø)
hybridse/src/udf/default_udf_library.cc	97.25% <100.00%> (ø)
hybridse/src/codegen/array_ir_builder.h	25.00% <0.00%> (ø)
hybridse/src/codegen/ir_base_builder.cc	67.98% <66.66%> (ø)
hybridse/src/codegen/type_ir_builder.cc	82.05% <85.00%> (ø)
... and 3 more

... and 517 files with indirect coverage changes

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[tobegit3hub]

LGTM