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https://issues.apache.org/jira/browse/SQOOP-331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jarek Jarcec Cecho updated SQOOP-331:
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Status: Patch Available (was: Open)
> Support boundary query on the command line
> ------------------------------------------
>
> Key: SQOOP-331
> URL: https://issues.apache.org/jira/browse/SQOOP-331
> Project: Sqoop
> Issue Type: New Feature
> Components: tools
> Affects Versions: 1.4.0
> Reporter: Jarek Jarcec Cecho
> Assignee: Jarek Jarcec Cecho
> Attachments: SQOOP-331.patch, SQOOP-331.patch
>
>
> It would be nice if the sqoop would have ability to specify query that will
> fetch minimal and maximal value for creating splits in
> DataDrivenDBInputFormat from the command line.
> Normally sqoop will generate query to get maximal and minimal value for
> creating splits in following form: SELECT min($split_by_column),
> max($split_by_column) FROM $table WHERE $cmd_where. In my use case, I needed
> to import only portion of data with ranges based on the split_by_column that
> I already have preselected and that are available in special table that holds
> data ranges and appropriate primary key values. So my auto generated query
> looked like this: SELECT min(id), max(id) FROM table WHERE id => min_id and
> id <= max_id. That query is obviously useless and is just creating
> unnecessary load on the database server. It would be nice to supply my own
> boundary query that will use the extra table with data ranges.
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