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https://issues.apache.org/jira/browse/KYLIN-2575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16753685#comment-16753685
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Shaofeng SHI commented on KYLIN-2575:
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Hi Yuzhang, I think the previous implementation is incompleted, and so was
reverted to avoid impacting on other functions.
What's the difference with defining a view in Hive and then using the view as
Kylin's source table?
> Experimental feature: Computed Column
> -------------------------------------
>
> Key: KYLIN-2575
> URL: https://issues.apache.org/jira/browse/KYLIN-2575
> Project: Kylin
> Issue Type: New Feature
> Reporter: hongbin ma
> Assignee: hongbin ma
> Priority: Major
>
> Computed column is a virtual column that is calculated from an expression of
> existing columns. For example, TAX is computed from PRICE * TAX_RATE; TX_YEAR
> is from EXTRACT(year from TX_DATE).
> Currently user have to create a view to enrich these computed columns, then
> feed the view to cube. This has two inconvenience:
> Create a view is not easy.
> The query has to be rewritten to use view instead of the original table.
> Let Kylin directly support computed column will be a big step forward.
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