[jira] [Commented] (ARROW-11279) [Rust][Parquet] ArrowWriter Definition Levels Memory Usage

["R J (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-11279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17266688#comment-17266688 ] 

R J commented on ARROW-11279:
-----------------------------

I think this can be solved by incrementally calculating array levels per column as definition levels appear distinct per column. First time contributing but I have prepared a pull request

> [Rust][Parquet] ArrowWriter Definition Levels Memory Usage
> ----------------------------------------------------------
>
>                 Key: ARROW-11279
>                 URL: https://issues.apache.org/jira/browse/ARROW-11279
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust
>            Reporter: R J
>            Priority: Minor
>   Original Estimate: 0.25h
>  Remaining Estimate: 0.25h
>
> In the rust implementation of an Arrow RecordBatch writer to parquet (3.0.0-SNAPSHOT), the ArrowWriter::write call potentially allocates more memory than required.
> For a RecordBatch with m rows and n columns, ArrowWriter::write allocates m*n definition levels, leading to m times the required memory usage.



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