Remove duplicated import of to/from-parquet

[douglasdavis]

I noticed when using the new from_parquet (implemented in awkward._v2.operations.convert) that the top level awkward._v2 namespace imports the parquet read/write functions twice.

[douglasdavis]

Perhaps this PR should also remove the ak_from_parquet.py and ak_to_parquet.py files in the io module?

[jpivarski]

Perhaps this PR should also remove the ak_from_parquet.py and ak_to_parquet.py files in the io module?

Yes, that would be helpful, thank you! This PR illustrates the fact that the "io" submodule has to be removed because I forgot and created from_parquet/to_parquet in two places. When I revamp the from_json/to_json, I'll move them to "convert" also.

(There's not enough mental distinction between "io" and "convert" to be clear on which should go where. Users don't see it, anyway—everything is just ak.*—it was just for our internal organization. Maybe the whole level of hierarchy should be reduced by one, so that all of those ak_* submodules are directly in "operations". Almost everything is in "structure", anyway. I may do that at the same time as internal renaming, to get the layout method names consistent with the high-level function names, but that would be a separate PR, timed to not interfere with other work.)

[codecov]

Codecov Report

Merging #1435 (518397c) into main (edfce38) will decrease coverage by 0.18%.
The diff coverage is 58.57%.

Impacted Files	Coverage Δ
src/awkward/_v2/_connect/cuda/__init__.py	0.00% <0.00%> (ø)
src/awkward/_v2/_connect/jax/__init__.py	0.00% <0.00%> (ø)
src/awkward/_v2/operations/convert/ak_from_cupy.py	50.00% <0.00%> (+23.33%)	⬆️
src/awkward/_v2/operations/convert/ak_from_iter.py	93.75% <ø> (ø)
src/awkward/_v2/operations/convert/ak_from_jax.py	50.00% <0.00%> (-25.00%)	⬇️
...wkward/_v2/operations/convert/ak_to_arrow_table.py	100.00% <ø> (ø)
src/awkward/_v2/operations/convert/ak_to_cupy.py	33.33% <0.00%> (+23.95%)	⬆️
src/awkward/_v2/operations/convert/ak_to_jax.py	33.33% <0.00%> (-41.67%)	⬇️
src/awkward/_v2/operations/describe/ak_backend.py	10.00% <0.00%> (-2.50%)	⬇️
src/awkward/_v2/operations/io/__init__.py	100.00% <ø> (ø)
... and 67 more

[douglasdavis]

Sounds good! this narrow focused PR should be good to go then

[jpivarski]

Thanks!