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https://issues.apache.org/jira/browse/PARQUET-2222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17747231#comment-17747231
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Gang Wu edited comment on PARQUET-2222 at 7/26/23 4:12 AM:
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Actually in the specs, RLE has been stated *as an alternative to PLAIN* for
boolean values {*}6 years ago{*}:
https://github.com/apache/parquet-format/blob/master/Encodings.md?plain=1#L127
{quote}Note that the RLE encoding method is only supported for the following
types of
data:
* Repetition and definition levels
* Dictionary indices
* Boolean values in data pages, as an alternative to PLAIN encoding{quote}
Should we just keep the specs as is and let the implementations decide which
encoding
to use for boolean values?
was (Author: wgtmac):
Make sense. Then we probably have to fix the description of the specs.
> [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
> Assignee: Xuwei Fu
> 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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