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https://issues.apache.org/jira/browse/PARQUET-2222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17701660#comment-17701660
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ASF GitHub Bot commented on PARQUET-2222:
-----------------------------------------
gszadovszky commented on PR #193:
URL: https://github.com/apache/parquet-format/pull/193#issuecomment-1473665965
@wgtmac is correct that `length` is left out only in case of `v2` `DL` and
`RL`. Meanwhile I agree with @pitrou that the note is better to be mentioned at
the grammar spec:
```
// length is not written for definition/repetition levels in v2 data pages
since it is duplicated in the `DataPageHeaderV2`
length := length of the <encoded-data> in bytes stored as 4 bytes little
endian (unsigned int32)
```
> [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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