Reynold Xin created SPARK-7135:
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Summary: Add a Column expression that can generates unique IDs for
each row
Key: SPARK-7135
URL: https://issues.apache.org/jira/browse/SPARK-7135
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Reynold Xin
Seems like a common use case that users might want a unique ID for each row. It
is more expensive to have consecutive IDs, since that'd require two pass over
the data. However, many use cases can be satisfied by just having unique ids.
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