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From "John Sichi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1228) allow HBase key column to be anywhere in Hive table, and expose timestamp column for read and write
Date Wed, 10 Mar 2010 20:26:27 GMT
allow HBase key column to be anywhere in Hive table, and expose timestamp column for read and
write
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                 Key: HIVE-1228
                 URL: https://issues.apache.org/jira/browse/HIVE-1228
             Project: Hadoop Hive
          Issue Type: Improvement
    Affects Versions: 0.6.0
            Reporter: John Sichi
             Fix For: 0.6.0


Current column mapping support requires key column to be first in Hive table (and implicit
rather than explicit in column mapping).  We should allow it to be specified explicitly at
any position within column mapping, e.g. with syntax :key to distinguish it from normal columns/families.

Together with this, allow :timestamp column to be mapped.  For writes, this would allow timestamp
to be explicitly provided by query (although we may want to prevent this in some cases; see
for example HIVE-1223 and HIVE-1225).  For reads, this would allow timestamp to be fetched,
and filters on timestamp could be used to find particular row versions.  (If no filter is
supplied, should we return all row versions or only the default latest version?  The semantics
need to be well-defined here.)


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