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https://issues.apache.org/jira/browse/CARBONDATA-1526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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kumar vishal reassigned CARBONDATA-1526:
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Assignee: Kunal Kapoor
> 10. Handle compaction in aggregation tables.
> --------------------------------------------
>
> Key: CARBONDATA-1526
> URL: https://issues.apache.org/jira/browse/CARBONDATA-1526
> Project: CarbonData
> Issue Type: Sub-task
> Reporter: Ravindra Pesala
> Assignee: Kunal Kapoor
>
> User can trigger compaction on pre-aggregate table directly, it will further
> merge the segments inside pre-aggregation table. To do that, use ALTER TABLE
> COMPACT command on the pre-aggregate table just like the main table.
> For implementation, there are two kinds of implementation for compaction.
> 1. Mergable pre-aggregate tables: if aggregate functions are count, max, min,
> sum, avg, the pre-aggregate table segments can be merged directly without
> re-computing it.
> 2. Non-mergable pre-aggregate tables: if aggregate function include
> distinct_count, it needs to re-compute when doing compaction on pre-aggregate
> table.
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