[jira] [Work started] (HIVE-21344) CBO: Reduce compilation time in presence of materialized views

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21344?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-21344 started by Jesus Camacho Rodriguez.
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> CBO: Reduce compilation time in presence of materialized views
> --------------------------------------------------------------
>
>                 Key: HIVE-21344
>                 URL: https://issues.apache.org/jira/browse/HIVE-21344
>             Project: Hive
>          Issue Type: Bug
>          Components: Materialized views
>    Affects Versions: 4.0.0
>            Reporter: Gopal V
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: calcite-planner-after-fix.svg.zip, mv-get-from-remote.png
>
>
> For every query, {{getAllValidMaterializedViews}} still requires a call to metastore to verify that the materializations exist, whether they are outdated or not, etc. Since this is only useful for active-active HS2 deployments, we could take a less aggressive approach and check this information only after rewriting has been triggered. In addition, we could refresh the information in the HS2 registry periodically in a background thread.
> {code}
> // This is not a rebuild, we retrieve all the materializations. In turn, we do not need
> // to force the materialization contents to be up-to-date, as this is not a rebuild, and
> // we apply the user parameters (HIVE_MATERIALIZED_VIEW_REWRITING_TIME_WINDOW) instead.
> materializations = db.getAllValidMaterializedViews(getTablesUsed(basePlan), false, getTxnMgr());
> {code}
> !mv-get-from-remote.png!



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