Owen O'Malley created ORC-577:
---------------------------------
Summary: Allow row-level filtering
Key: ORC-577
URL: https://issues.apache.org/jira/browse/ORC-577
Project: ORC
Issue Type: New Feature
Reporter: Owen O'Malley
Currently, ORC filters at three levels:
* File level
* Stripe (64 to 256mb) level
* Row group (10k row) level
The filters are specified as Sargs (Search Arguments), which have a relatively
small vocabulary. Furthermore, they only filter sets of rows if they can
guarantee that none of the rows can pass the filter.
There are some use cases where the user needs to read a subset of the columns
and apply more detailed row level filters. I'd suggest that we add a new method
in Reader.Options
{{setFilter(String columnNames, Predicate<VectorizedRowBatch> filter)}}
Where the columns named in columnNames are read expanded first, then the filter
is run and the rest of the data is read only if the predicate returns true.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
