[jira] [Commented] (PARQUET-2222) [Format] RLE encoding spec incorrect for v2 data pages

["Xuwei Fu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-2222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17693798#comment-17693798 ] 

Xuwei Fu commented on PARQUET-2222:
-----------------------------------

I don't understand. Isn't length the part of encoding in spec?

And seems that DataPageV2 in parquet-mr is not in-prod?

 

> [Format] RLE encoding spec incorrect for v2 data pages
> ------------------------------------------------------
>
>                 Key: PARQUET-2222
>                 URL: https://issues.apache.org/jira/browse/PARQUET-2222
>             Project: Parquet
>          Issue Type: Bug
>          Components: parquet-format
>            Reporter: Antoine Pitrou
>            Priority: Critical
>             Fix For: format-2.10.0
>
>
> The spec (https://github.com/apache/parquet-format/blob/master/Encodings.md#run-length-encoding--bit-packing-hybrid-rle--3) has this:
> {code}
> rle-bit-packed-hybrid: <length> <encoded-data>
> length := length of the <encoded-data> in bytes stored as 4 bytes little endian (unsigned int32)
> {code}
> But the length is actually prepended only in v1 data pages, not in v2 data pages.



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