Allow user-configurable indexing strategies for dimensions

[jon-wei]

Druid could support a wider range of index strategies beyond bitmap indexes. Possible configurations could include:

• String dimensions without bitmap indexes
• Range indexes
• Spatial indexes on multiple data types (e.g., long coordinates)
• tries for String dimensions

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Related issues:
#2622
#2292

[fjy]

👍

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[stale]

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