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Posted to issues@hive.apache.org by "Denys Kuzmenko (Jira)" <ji...@apache.org> on 2023/03/21 09:03:00 UTC

[jira] [Assigned] (HIVE-27160) Iceberg: Optimise delete (entire) data from table

     [ https://issues.apache.org/jira/browse/HIVE-27160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Denys Kuzmenko reassigned HIVE-27160:
-------------------------------------

    Assignee: Denys Kuzmenko

> Iceberg: Optimise delete (entire) data from table
> -------------------------------------------------
>
>                 Key: HIVE-27160
>                 URL: https://issues.apache.org/jira/browse/HIVE-27160
>             Project: Hive
>          Issue Type: Task
>            Reporter: Denys Kuzmenko
>            Assignee: Denys Kuzmenko
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Currently, in MOR mode, Hive creates "positional delete" files during deletes. With "Delete from ", the entire dataset in the table or partition is written as a "positional delete" file.
> During the read operation, all these files are read again causing huge delay.
> Proposal: apply "truncate" optimization in case of "delete *".



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