[
https://issues.apache.org/jira/browse/HIVE-553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zheng Shao updated HIVE-553:
----------------------------
Attachment: HIVE-553.3.patch
Removed the support of Map type.
We didn't find a good way to define the order of map type, so we removed the
support of map type in BinarySortableSerDe.
This does not affect any existing functionality of hive, since we never allow
order by, group by, and join on a map-type column.
> Add BinarySortableSerDe to Hive
> -------------------------------
>
> Key: HIVE-553
> URL: https://issues.apache.org/jira/browse/HIVE-553
> Project: Hadoop Hive
> Issue Type: New Feature
> Affects Versions: 0.3.0, 0.3.1
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Attachments: HIVE-553.2.patch, HIVE-553.3.patch
>
>
> Currently the most popular SerDe in Hive is LazySimpleSerDe. LazySimpleSerDe
> has the benefit of being simple (use text format to store data), but its
> performance may suffer in the following cases:
> 1. For double values, we are storing them in text format which is very
> space-inefficient, and both serialization and deserialization are slow;
> 2. For complex type of columns that contains a lot of levels, we are scanning
> the buffer once per level, which is very inefficient.
> We should add a binary serde format that stores the data in binary format.
> The format should have the following properties:
> 1. Compact: it should be space-efficient;
> 2. Fast: it should be efficiently to deserialize the data, especially for
> double values and complex types.
> 3. It should support serializing NULL values.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
