[jira] [Resolved] (PARQUET-2241) ByteStreamSplitDecoder broken in presence of nulls

["Gabor Szadovszky (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PARQUET-2241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabor Szadovszky resolved PARQUET-2241.
---------------------------------------
    Resolution: Fixed

> ByteStreamSplitDecoder broken in presence of nulls
> --------------------------------------------------
>
>                 Key: PARQUET-2241
>                 URL: https://issues.apache.org/jira/browse/PARQUET-2241
>             Project: Parquet
>          Issue Type: Bug
>          Components: parquet-format, parquet-mr
>    Affects Versions: format-2.8.0
>            Reporter: Xuwei Fu
>            Assignee: Gang Wu
>            Priority: Major
>
>  
> This problem is shown in this issue: [https://github.com/apache/arrow/issues/15173|https://github.com/apache/arrow/issues/15173Let]
> Let me talk about it briefly:
> * Encoder doesn't write "num_values" on Page payload for BYTE_STREAM_SPLIT, but using "num_values" as stride in BYTE_STREAM_SPLIT
> * When decoding, for DATA_PAGE_V2, it can now the num_values and num_nulls in the page, however, in DATA_PAGE_V1, without statistics, we should read def-levels and rep-levels to get the real num-of-values. And without the num-of-values, we aren't able to decode BYTE_STREAM_SPLIT correctly
>  
> The bug-reproducing code is in the issue.



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