Bug Fix: Nullability seems to be changed by Spark when writing Parque…

[halfabrane]

…t. Avoid enforcing nullability constraints

Fixes #203

[codecov-io]

Codecov Report

Merging #204 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #204   +/-   ##
=====================================
  Coverage      90%    90%           
=====================================
  Files          52     52           
  Lines        1790   1790           
  Branches      129    130    +1     
=====================================
  Hits         1611   1611           
  Misses        179    179

Impacted Files	Coverage Δ
src/main/scala/magellan/catalyst/SpatialJoin.scala	95.23% <ø> (-2.39%)	⬇️
...che/spark/sql/catalyst/expressions/functions.scala	94.61% <100%> (ø)	⬆️
...in/scala/org/apache/spark/sql/types/PointUDT.scala	100% <0%> (+3.12%)	⬆️

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