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https://issues.apache.org/jira/browse/PARQUET-407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergio Peña resolved PARQUET-407.
---------------------------------
Resolution: Fixed
Fix Version/s: format-2.4.0
Issue resolved by pull request 35
[https://github.com/apache/parquet-format/pull/35]
> Incorrect delta-encoding example
> --------------------------------
>
> Key: PARQUET-407
> URL: https://issues.apache.org/jira/browse/PARQUET-407
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-format
> Reporter: choi woo cheol
> Priority: Trivial
> Fix For: format-2.4.0
>
>
> The minimum and the number of bits are incorrect at delta encoding Example 2
> In {{Encodings.md}}.
> In the example,
> {code}
> Example 2
> 7, 5, 3, 1, 2, 3, 4, 5, the deltas would be
> -2, -2, -2, 1, 1, 1, 1
> The minimum is -2, so the relative deltas are:
> 0, 0, 0, 3, 3, 3, 3
> The encoded data is
> header: 8 (block size), 1 (miniblock count), 8 (value count), 7 (first value)
> block 0 (minimum delta), 2 (bitwidth), 000000111111b (0,0,0,3,3,3 packed on 2
> bits)
> {code}
> The minimum is -2 and the relative deltas are 0, 0, 0, 3, 3, 3, 3. So, this
> should be corrected as below:
> {code}
> block -2 (minimum delta), 2 (bitwidth), 00000011111111b (0,0,0,3,3,3,3 packed
> on 2 bits)
> {code}
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