[jira] [Reopened] (HIVE-27187) Incremental rebuild of materialized view having aggregate and stored by iceberg

["Krisztian Kasa (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-27187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Krisztian Kasa reopened HIVE-27187:
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> Incremental rebuild of materialized view having aggregate and stored by iceberg
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-27187
>                 URL: https://issues.apache.org/jira/browse/HIVE-27187
>             Project: Hive
>          Issue Type: Improvement
>          Components: Iceberg integration, Materialized views
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 4h
>  Remaining Estimate: 0h
>
> Currently incremental rebuild of materialized view stored by iceberg which definition query contains aggregate operator is transformed to an insert overwrite statement which contains a union operator if the source tables contains insert operations only. One branch of the union scans the view the other produces the delta.
> This can be improved further: transform the statement to a multi insert statement representing a merge statement to insert new aggregations and update existing.



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