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https://issues.apache.org/jira/browse/HIVE-1361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881448#action_12881448
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Ning Zhang commented on HIVE-1361:
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Some comments from internal design review:
- The ANALYZE TABLE command should be integrated with the data replication
hook. When an existing table/partition is analyzed, a new WriteEntity should be
generated to make metadata replication work.
- Investigate JDO on top of HBase integration. If JDO works on HBase, we could
just use JDO to update column stats as well.
- ANALYZE TABLE partition (<partition_spec>) should support
"dynamic-partition-style" partition specification. This means the if there are
2 partition columns ds, hr, we can do analyze table partition(ds =
'2010-06-01', hr) to analyze all hr sub-partitions under ds='2010-06-01'.
> table/partition level statistics
> --------------------------------
>
> Key: HIVE-1361
> URL: https://issues.apache.org/jira/browse/HIVE-1361
> Project: Hadoop Hive
> Issue Type: Sub-task
> Affects Versions: 0.6.0
> Reporter: Ning Zhang
> Assignee: Ahmed M Aly
>
> At the first step, we gather table-level stats for non-partitioned table and
> partition-level stats for partitioned table. Future work could extend the
> table level stats to partitioned table as well.
> There are 3 major milestones in this subtask:
> 1) extend the insert statement to gather table/partition level stats
> on-the-fly.
> 2) extend metastore API to support storing and retrieving stats for a
> particular table/partition.
> 3) add an ANALYZE TABLE [PARTITION] statement in Hive QL to gather stats for
> existing tables/partitions.
> The proposed stats are:
> Partition-level stats:
> - number of rows
> - total size in bytes
> - number of files
> - max, min, average row sizes
> - max, min, average file sizes
> Table-level stats in addition to partition level stats:
> - number of partitions
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