[jira] [Updated] (CARBONDATA-1526) 10. Handle compaction in aggregation tables.

[Akash R Nilugal (Jira)]

     [ https://issues.apache.org/jira/browse/CARBONDATA-1526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ravindra Pesala updated CARBONDATA-1526:
----------------------------------------
    Summary: 10. Handle compaction in aggregation tables.  (was: 10. Handle compaction in aggregation tables. Compaction of aggregation should be in syc with main table.)

> 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
>
> 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.

--
This message was sent by Atlassian JIRA
(v6.4.14#64029)