[jira] [Updated] (ORC-593) Allow row-level Skipping

["Panagiotis Garefalakis (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ORC-593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Panagiotis Garefalakis updated ORC-593:
---------------------------------------
    Summary: Allow row-level Skipping  (was: Allow row level Skipping)

> Allow row-level Skipping
> ------------------------
>
>                 Key: ORC-593
>                 URL: https://issues.apache.org/jira/browse/ORC-593
>             Project: ORC
>          Issue Type: Improvement
>            Reporter: Panagiotis Garefalakis
>            Priority: Major
>             Fix For: 1.5.8
>
>
> Currently, ORC supports filtering at: File, Stripe, and row group level.
> There is an on-going effort to add more detailed row-level filters using filter Predicates as part of the Reader.Options as part of [ORC-577|https://issues.apache.org/jira/browse/ORC-577].
> However, there are still cases where the framework implementing the TreeReader interface wants to skip particular rows to avoid expensive type Decode i.e DecimalColumnVector or Decimal64ColumnVector type.
> In this ticket I propose to support extend the TreeReader abstract class with an extra method next Vector method.
> {code:java}
> abstract void nextVector(ColumnVector previous,
>  boolean[] isNull, boolean[] skipRows,
>  final int batchSize){code}
> The subclasses implementing this method will be able to use the skipRows method to avoid expensive decoding when needed.



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