Parquet column array<struct<>> with null value is read in as empty list

[puchengy]

Apache Iceberg version

main (development)

Please describe the bug 🐞

An Iceberg table with column type array that has null value is read in as empty list, however, it should be none instead.

reproducible scripts: puchengy@3fd6d3d

shows

>       assert pyberg_val == direct_val
E       assert [] == None

[Fokko]

Great catch @puchengy, let me see what's needed to fix this

[Fokko]

I've found the issue. We don't respect the null count when fetching the array through the accessor:

We just return the array and then create a new array with offset 1, and then it just injects a []

[HonahX]

There is still an edge case unfixed. We need to wait for an upstream fix: apache/arrow#38809

ref: #252 (comment)

[github-actions]

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[HonahX]

Reply to re-activate the issue : )