[jira] [Assigned] (ORC-144) PATCHED BASE Documentation Issues

["Owen O'Malley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ORC-144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Owen O'Malley reassigned ORC-144:
---------------------------------

    Assignee: Douglas Drinka

> PATCHED BASE Documentation Issues
> ---------------------------------
>
>                 Key: ORC-144
>                 URL: https://issues.apache.org/jira/browse/ORC-144
>             Project: Orc
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Douglas Drinka
>            Assignee: Douglas Drinka
>            Priority: Minor
>
> The documentation for Patched Base encoding has two issues.
> First is a repeat of "Data values (W * L bits padded to the byte)..." in the data field description.
> Second is in the example given.  The sample data for all the other encoding formats actually trigger their encoder based on the logic in the java code.  However this example sequence is too short to trigger both the 90% cutoff for non-rebased data (1.0-.9)*10 = 0.99999999999999978 which floors to 0, and the 95% cutoff of rebased data.  At least 20 values are needed for a single patch to occur.
> I propose the following sequence:
> [2030, 2000, 2020, 1000000, 2040, 2050, 2060, 2070, 2080, 2090, 2100, 2110, 2120, 2130, 2140, 2150, 2160, 2170, 2180, 2190]
> Which encodes to [0x8e, 0x13, 0x2b, 0x21, 0x07, 0xd0, 0x1e, 0x00, 0x14, 0x70, 0x28, 0x32, 0x3c, 0x46, 0x50, 0x5a, 0x64, 0x6e, 0x78, 0x82, 0x8c, 0x96, 0xa0, 0xaa, 0xb4, 0xbe, 0xfc, 0xe8]
> Then in the description the wording should be "a length of 20 (19)".
> These samples were critical for me to verify my code, and I appreciated them being provided, particularly since I didn't find any unit tests available in the java code to directly compare byte outputs of the encoders.



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