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https://issues.apache.org/jira/browse/SQOOP-1055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jarek Jarcec Cecho updated SQOOP-1055:
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Summary: Add option to export from Hive use HQL query (was: Add Sqoop
export --query option)
> Add option to export from Hive use HQL query
> --------------------------------------------
>
> Key: SQOOP-1055
> URL: https://issues.apache.org/jira/browse/SQOOP-1055
> Project: Sqoop
> Issue Type: Improvement
> Reporter: Hari Sekhon
>
> Sqoop currently has a --query option for import but not for export.
> It would be nice if the export --query option supporting HiveQL could be
> added as users currently have to create a temporary table and then export
> that as a two step process with a full disk re-write of all the
> to-be-exported data to a new table before the sqoop export command is started.
> Since Sqoop executes a distributed map-only job, I believe certain queries
> such as joins that have to be done via a reduce phase will yield little
> performance improvement due to the map->reduce intermediate writes needing to
> be written anyway. However we could save on the final reduce phase writes and
> also turn this in to a more convenient one step instead two step process.
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