fix concat-null

[acquamarin]

1. Fix concat-null function bug.
2. Added

void ValueVector::copyFromVectorData(
    uint64_t posToCopy, const ValueVector* srcVector, uint64_t srcPos)

which removes the assumption that the srcValue must be null

[codecov]

Codecov Report

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

Comparison is base (a129767) 91.17% compared to head (4b20699) 91.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1765      +/-   ##
==========================================
- Coverage   91.17%   91.17%   -0.01%     
==========================================
  Files         769      769              
  Lines       28177    28153      -24     
==========================================
- Hits        25690    25668      -22     
+ Misses       2487     2485       -2     

Impacted Files	Coverage Δ
src/include/common/vector/value_vector.h	100.00% <ø> (ø)
src/common/vector/value_vector.cpp	100.00% <100.00%> (ø)
src/expression_evaluator/case_evaluator.cpp	81.72% <100.00%> (-0.39%)	⬇️
src/function/vector_list_operation.cpp	90.10% <100.00%> (-0.09%)	⬇️
src/function/vector_struct_operations.cpp	94.82% <100.00%> (+0.98%)	⬆️
...unction/list/operations/base_list_sort_operation.h	94.44% <100.00%> (-0.16%)	⬇️
...e/function/list/operations/list_append_operation.h	100.00% <100.00%> (ø)
...e/function/list/operations/list_concat_operation.h	100.00% <100.00%> (ø)
.../function/list/operations/list_prepend_operation.h	100.00% <100.00%> (ø)
...de/function/list/operations/list_slice_operation.h	100.00% <100.00%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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