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PARQUET-2362: Clarify parquet encoding #217

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Oct 14, 2023
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PARQUET-2362: Clarify parquet encoding #217

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4 changes: 2 additions & 2 deletions Encodings.md
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Expand Up @@ -54,7 +54,7 @@ using the [RLE/Bit-Packing Hybrid](#RLE) encoding. If the dictionary grows too b
or number of distinct values, the encoding will fall back to the plain encoding. The dictionary page is
written first, before the data pages of the column chunk.

Dictionary page format: the entries in the dictionary - in dictionary order - using the [plain](#PLAIN) encoding.
Dictionary page format: the entries in the dictionary using the [plain](#PLAIN) encoding.

Data page format: the bit width used to encode the entry ids stored as 1 byte (max bit width = 32),
followed by the values encoded using RLE/Bit packed described above (with the given bit width).
Expand Down Expand Up @@ -148,7 +148,7 @@ Whether prepending the four-byte `length` to the `encoded-data` is summarized as

This is a bit-packed only encoding, which is deprecated and will be replaced by the [RLE/bit-packing](#RLE) hybrid encoding.
Each value is encoded back to back using a fixed width.
There is no padding between values (except for the last byte) which is padded with 0s.
There is no padding between values (except for the last byte, which is padded with 0s).
For example, if the max repetition level was 3 (2 bits) and the max definition level as 3
(2 bits), to encode 30 values, we would have 30 * 2 = 60 bits = 8 bytes.

Expand Down