[jira] [Assigned] (HIVE-25656) Get materialized view state based on number of affected rows by transactions

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

     [ https://issues.apache.org/jira/browse/HIVE-25656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Krisztian Kasa reassigned HIVE-25656:
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> Get materialized view state based on number of affected rows by transactions
> ----------------------------------------------------------------------------
>
>                 Key: HIVE-25656
>                 URL: https://issues.apache.org/jira/browse/HIVE-25656
>             Project: Hive
>          Issue Type: Improvement
>          Components: Materialized views, Transactions
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>             Fix For: 4.0.0
>
>
> To enable the faster incremental rebuild of materialized views presence of update/delete operations on the source tables of the view since the last rebuild must be checked. Based on the outcome different plan is generated for scenarios in presence of update/delete and insert only operations.
> Currently this is done by querying the COMPLETED_TXN_COMPONENTS table however the records from this table is cleaned when MV source tables are compacted. This reduces the chances of incremental MV rebuild.
> The goal of this patch is to find an alternative way to store and retrieve this information.



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