Parquet reader fails to read null list.

[novemberkilo]

Describe the bug
Parquet reader fails to read a parquet file that is generated from this json:

{"emptylist":[]}

To Reproduce
I have written a test on a branch to reproduce this failure.

1. Generated a parquet-file from the aforementioned json. See WIP - Fix bug JSON input barfs on {"emptylist":[]}  #1063 (comment) and the related issue for context. Verified that this parquet file can be read using pyarrow as the following arrow table:

>>> empty_table = pq.read_table("empty_table.parquet")
>>> empty_table
pyarrow.Table
emptylist: list<item: null>
  child 0, item: null
----
emptylist: [[0 nulls]]

2. Added this parquet file to a branch of my fork of parquet-testing novemberkilo/parquet-testing@a827b12

3. Wrote a test that reads this file.

Test: novemberkilo@e5952ae
Failure: https://github.com/novemberkilo/arrow-rs/runs/5431110483?check_suite_focus=true#step:4:1999
Failure: https://github.com/novemberkilo/arrow-rs/runs/5431134675?check_suite_focus=true#step:7:1944

Expected behavior
Should read the file (like pyarrow can)

Additional context
This is all related to this original issue #1036 // @alamb

[alamb]

@novemberkilo notes that this is a blocker to #1036

I don't fully understand how this bug report is related to the test failure, which seems to imply a missing file (rather than an error reading null lists)

https://github.com/novemberkilo/arrow-rs/runs/5431110483?check_suite_focus=true#step:4:1999

---- arrow::arrow_reader::tests::test_read_null_list stdout ----
thread 'arrow::arrow_reader::tests::test_read_null_list' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', parquet/src/arrow/arrow_reader.rs:1036:62
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[alamb]

I wonder if this could be related to #993 as well

[novemberkilo]

I'm sorry I've linked the wrong test run in the original bug report.

The correct one is here: https://github.com/novemberkilo/arrow-rs/runs/5431134675?check_suite_focus=true#step:7:1944

---- arrow::arrow_reader::tests::test_read_null_list stdout ----
thread 'arrow::arrow_reader::tests::test_read_null_list' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', parquet/src/arrow/arrow_reader.rs:1036:62
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace