Simplified Schema and Field

[jorgecarleitao]

• Schema no longer has its accessors, since all its attributes are public.
• Field lost most of its accessors, since all its attributes are public.
• merge_field, merge_datatypes, merge_schema was removed, since whether two fields or schemas can be merged is highly context dependent and can't be easily decided here

[codecov]

Codecov Report

Merging #728 (ea5344d) into main (c28d69e) will increase coverage by 0.17%.
The diff coverage is 79.51%.

@@            Coverage Diff             @@
##             main     #728      +/-   ##
==========================================
+ Coverage   70.53%   70.71%   +0.17%     
==========================================
  Files         311      311              
  Lines       16920    16853      -67     
==========================================
- Hits        11934    11917      -17     
+ Misses       4986     4936      -50     

Impacted Files	Coverage Δ
benches/filter_kernels.rs	0.00% <ø> (ø)
src/array/struct_/mod.rs	56.92% <0.00%> (ø)
src/compute/sort/mod.rs	26.66% <0.00%> (ø)
src/datatypes/mod.rs	97.22% <ø> (ø)
src/io/ipc/write/stream_async.rs	55.55% <0.00%> (ø)
src/io/json_integration/read/array.rs	79.50% <ø> (ø)
src/io/json_integration/write/schema.rs	0.00% <0.00%> (ø)
src/io/parquet/read/schema/metadata.rs	74.19% <ø> (ø)
src/io/parquet/write/mod.rs	62.31% <ø> (ø)
src/compute/cast/mod.rs	93.91% <50.00%> (ø)
... and 24 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c28d69e...ea5344d. Read the comment docs.