Fixed error in union FFI

[jorgecarleitao]

Closed #480

[codecov]

Codecov Report

Merging #625 (2a0a1d3) into main (b3ed162) will increase coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #625      +/-   ##
==========================================
+ Coverage   69.70%   69.77%   +0.06%     
==========================================
  Files         299      299              
  Lines       16599    16884     +285     
==========================================
+ Hits        11571    11780     +209     
- Misses       5028     5104      +76     

Impacted Files	Coverage Δ
src/array/union/ffi.rs	0.00% <0.00%> (ø)
src/io/parquet/read/nested_utils.rs	78.43% <0.00%> (+0.98%)	⬆️
src/compute/arithmetics/time.rs	46.93% <0.00%> (+2.04%)	⬆️
src/temporal_conversions.rs	77.41% <0.00%> (+2.93%)	⬆️
src/array/specification.rs	78.12% <0.00%> (+4.95%)	⬆️
src/types/mod.rs	31.18% <0.00%> (+7.57%)	⬆️
src/io/csv/write/serialize.rs	51.67% <0.00%> (+17.73%)	⬆️

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