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From "Sambavi Muthukrishnan (JIRA)" <>
Subject [jira] [Created] (HIVE-3610) Add a command "Explain dependency ..."
Date Tue, 23 Oct 2012 18:59:11 GMT
Sambavi Muthukrishnan created HIVE-3610:

             Summary: Add a command "Explain dependency ..."
                 Key: HIVE-3610
             Project: Hive
          Issue Type: New Feature
          Components: Query Processor
    Affects Versions: 0.9.0
            Reporter: Sambavi Muthukrishnan
            Assignee: Sambavi Muthukrishnan
            Priority: Minor

Add a new command "EXPLAIN DEPENDENCY".
Any query can be passed to EXPLAIN DEPENDENCY as with EXPLAIN (FORMATTED/EXTENDED). The output
of this command will be JSON that provides the list of tables and partitions that the query
depends on.

One possible use case is to determine the set of tables/views that are used by a view, and
the set of partitions that are used by a given query on that view. This will allow a view
to be replicated from one Hive instance to another, since we can determine the set of objects
that need to be replicated for replication of the view to be successful.

Example output:
{"input_tables":[{"tablename": "default@test_sambavi_v2", "tabletype": "EXTERNAL_TABLE"},
{"tablename": "default@test_sambavi_v1", "tabletype": "TABLE"}], "input partitions":["default@srcpart@ds=2008-04-08/hr=11","default@srcpart@ds=2008-04-08/hr=12"]}

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