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https://issues.apache.org/jira/browse/ARROW-17465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou updated ARROW-17465:
-----------------------------------
Component/s: C++
Parquet
> [Parquet] DELTA_BINARY_PACKED constraint on num_bits is too restrict?
> ---------------------------------------------------------------------
>
> Key: ARROW-17465
> URL: https://issues.apache.org/jira/browse/ARROW-17465
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Parquet
> Reporter: Jorge Leitão
> Priority: Major
>
> Consider the sequence of (int32) values
> [863490391,-816295192,1613070492,-1166045478,1856530847]
> This sequence can be encoded as a single block, single miniblock with a
> bit_width of 33.
> However, we currently require [1] the bit_width of each miniblock to be
> smaller than the bitwidth of the type it encodes.
> We could consider lifting this constraint, as, as shown in the example above,
> the values representation's `bit_width` can be smaller than the delta's
> representation's `bit_width`.
> [1]
> https://github.com/apache/arrow/blob/a376968089d7310f4a88d054822fa1eaf96c46f5/cpp/src/parquet/encoding.cc#L2173
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