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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2020/05/04 13:12:00 UTC

[jira] [Work started] (IMPALA-9579) Read support for BINARY in ORC

     [ https://issues.apache.org/jira/browse/IMPALA-9579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on IMPALA-9579 started by Csaba Ringhofer.
-----------------------------------------------
> Read support for BINARY in ORC
> ------------------------------
>
>                 Key: IMPALA-9579
>                 URL: https://issues.apache.org/jira/browse/IMPALA-9579
>             Project: IMPALA
>          Issue Type: Sub-task
>          Components: Backend
>            Reporter: Csaba Ringhofer
>            Assignee: Csaba Ringhofer
>            Priority: Major
>              Labels: orc
>
> ORC has its own BINARY type, which has some differences compared to STRING/VARCHAR/CHAR, as BINARY:
> - doesn't use dictionary encoding
> - doesn't store min/max values in the statistics
> The c++ library uses the same ColumnReader as for STRING, so the implementation efforts should be minimal: https://github.com/apache/orc/blob/a9ec6a2e39ed71ef8a2d874df14700956aa847be/c%2B%2B/src/ColumnReader.cc#L1752



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