[jira] [Updated] (ARROW-9728) [Rust] [Parquet] Compute nested spacing

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-9728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-9728:
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    Labels: pull-request-available  (was: )

> [Rust] [Parquet] Compute nested spacing
> ---------------------------------------
>
>                 Key: ARROW-9728
>                 URL: https://issues.apache.org/jira/browse/ARROW-9728
>             Project: Apache Arrow
>          Issue Type: Sub-task
>          Components: Rust
>    Affects Versions: 1.0.0
>            Reporter: Neville Dipale
>            Assignee: Neville Dipale
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When computing definition levels for deeply nested arrays that include lists, the definition levels are correctly calculated, but they are not translated into correct indexes for the eventual primitive arrays.
> For example, an int32 array could have no null values, but be a child of a list that has null values. If say the first 5 values of the int32 array are members of the first list item (i.e. list_array[0] = [1,2,3,4,5], and that list is itself a child of a struct whose index is null, the whole 5 values of the int32 array *should* be skipped. Further, the list's definition and repetition levels will be represented by 1 slot instead of the 5.
> The current logic cannot cater for this, and potentially results in slicing the int32 array incorrectly (sometimes including some of those first 5 values).
> This Jira is for the work necessary to compute the index into the eventual leaf arrays correctly.
> I started doing it as part of the initial writer PR, but it's complex and is blocking progress.



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