[
https://issues.apache.org/jira/browse/HIVE-3874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13583078#comment-13583078
]
Phabricator commented on HIVE-3874:
-----------------------------------
njain has commented on the revision "HIVE-3874 [jira] Create a new Optimized
Row Columnar file format for Hive".
1. Can you add more comments - specially, in the class/interface definitions
Writer/TreeWriter/StreamFactory to name a few.
2. Can column statistics be made optional ? (can be a follow-up)
3. This has a lot of new code - I mean, is it possible to use some of the
constructs which are
already there - for eg. RedBlackTrees, RLE etc. Can you use some existing
implementations
instead of writing these from scratch ?
REVISION DETAIL
https://reviews.facebook.net/D8529
To: JIRA, omalley
Cc: kevinwilfong, njain
> Create a new Optimized Row Columnar file format for Hive
> --------------------------------------------------------
>
> Key: HIVE-3874
> URL: https://issues.apache.org/jira/browse/HIVE-3874
> Project: Hive
> Issue Type: Improvement
> Components: Serializers/Deserializers
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Attachments: hive.3874.2.patch, HIVE-3874.D8529.1.patch,
> HIVE-3874.D8529.2.patch, OrcFileIntro.pptx, orc.tgz
>
>
> There are several limitations of the current RC File format that I'd like to
> address by creating a new format:
> * each column value is stored as a binary blob, which means:
> ** the entire column value must be read, decompressed, and deserialized
> ** the file format can't use smarter type-specific compression
> ** push down filters can't be evaluated
> * the start of each row group needs to be found by scanning
> * user metadata can only be added to the file when the file is created
> * the file doesn't store the number of rows per a file or row group
> * there is no mechanism for seeking to a particular row number, which is
> required for external indexes.
> * there is no mechanism for storing light weight indexes within the file to
> enable push-down filters to skip entire row groups.
> * the type of the rows aren't stored in the file
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
