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From "Jarek Jarcec Cecho (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SQOOP-331) Support boundary query on the command line
Date Sun, 04 Sep 2011 18:31:09 GMT
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

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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