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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