[GitHub] [parquet-format] emkornfield commented on a change in pull request #170: WIP: [Docs] Add description of RLE-bipacked encoder

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emkornfield commented on a change in pull request #170:
URL: https://github.com/apache/parquet-format/pull/170#discussion_r606333683



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File path: rle-bitpacked.md
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+# RLE-Bitpacked hybrid encoder
+
+The RLE-Bitpacked hybrid encoder is a parquet-specific encoder that combines two well known encoding strategies,
+[RLE](https://en.wikipedia.org/wiki/Run-length_encoding) and bitpacking. Note that "combine" here means this encoder allows both encodings within the same stream, and, during encoding, it can switch between them.
+
+This encoder is only used to encode integer values that may either represent definition levels, representation levels or ids of dictionary-encoded pages. Note that this encoder supports integers that can be represented in less than 8 bits.

Review comment:
       I thought in V2 this can be used for normal integers?




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