[HIVE-20468] Add ability to skip creating druid bitmap indexes for specific string dimensions

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Druid integration
• Assignee: Nishant Bangarwa
• Reporter: Nishant Bangarwa
• Created: 27/Aug/18 17:34
• Updated: 27/Aug/18 18:40

Description

Currently we create bitmap index for all druid dimensions.
For some columns (e.g Free form text, high cardinality columns that are rarely filtered upon), It may be beneficial to skip creating druid bitmap index and save disk space.

In druid https://github.com/apache/incubator-druid/pull/5402 added support for creating string dimension columns without bitmap indexes.
This task is to add similar option when indexing data from hive.