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https://issues.apache.org/jira/browse/HIVE-14497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez reassigned HIVE-14497:
----------------------------------------------
Assignee: Jesus Camacho Rodriguez
> Fine control for using materialized views in rewriting
> ------------------------------------------------------
>
> Key: HIVE-14497
> URL: https://issues.apache.org/jira/browse/HIVE-14497
> Project: Hive
> Issue Type: Sub-task
> Components: Materialized views
> Affects Versions: 2.2.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
>
> Follow-up of HIVE-14495. Since the number of materialized views in the system
> might grow very large, and query rewriting using materialized views might be
> very expensive, we need to include a mechanism to enable/disable materialized
> views for query rewriting.
> Thus, we should extend the CREATE MATERIALIZED VIEW statement as follows:
> {code:sql}
> CREATE MATERIALIZED VIEW [IF NOT EXISTS] [db_name.]materialized_view_name
> [BUILD DEFERRED]
> [ENABLE REWRITE] -- NEW!
> [COMMENT materialized_view_comment]
> [
> [ROW FORMAT row_format]
> [STORED AS file_format]
> | STORED BY 'storage.handler.class.name' [WITH SERDEPROPERTIES (...)]
> ]
> [LOCATION hdfs_path]
> [TBLPROPERTIES (property_name=property_value, ...)]
> AS select_statement;
> {code}
> Further, we should extend the ALTER statement in case we want to change the
> behavior of the materialized view after we have created it.
> {code:sql}
> ALTER MATERIALIZED VIEW [db_name.]materialized_view_name DISABLE REWRITE;
> {code}
> {code:sql}
> ALTER MATERIALIZED VIEW [db_name.]materialized_view_name ENABLE REWRITE;
> {code}
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