[jira] [Commented] (LENS-566) Add start time for fact as a fact property

["Rajat Khandelwal (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LENS-566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14550329#comment-14550329 ] 

Rajat Khandelwal commented on LENS-566:
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Created https://reviews.apache.org/r/34406/

> Add start time for fact as a fact property 
> -------------------------------------------
>
>                 Key: LENS-566
>                 URL: https://issues.apache.org/jira/browse/LENS-566
>             Project: Apache Lens
>          Issue Type: Improvement
>          Components: cube
>            Reporter: Amareshwari Sriramadasu
>            Priority: Critical
>
> When new facts are added and are populated with data from some time onwards, having start time property on the facts should help picking eligible facts for given range.
> Without the property, if a light fact is added from a later time and with lightest fact first flag on, the queries cannot be answered from older range. This causes queries to fail.
> Similarly we can add end time as well for the fact. 
> Also, there could be some facts on which data is valid from relative start time. For example : only 90 days of data is valid. Accepting relative start time will allow, even if drop partitions is not uptodate, query can pick proper facts.



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