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https://issues.apache.org/jira/browse/PARQUET-2241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17687228#comment-17687228
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ASF GitHub Bot commented on PARQUET-2241:
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emkornfield commented on PR #192:
URL: https://github.com/apache/parquet-format/pull/192#issuecomment-1426163629
Seems OK to me.
> 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
> 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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