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https://issues.apache.org/jira/browse/HIVE-1362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870229#action_12870229
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Ning Zhang commented on HIVE-1362:
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This is the 2nd subtask of HIVE-33 (stats in Hive tables).
We will gather column level stats based on users' request. It also depends on
HIVE-1361 in that the metastore API should suport storing and retrieving stats.
The major milestone for this subtasks are:
1) add a new HiveQL command to gather column level stats. Please see HIVE-33
for the syntax.
2) add new UDFs/UDAFs to compute these statistics.
The proposed statistics are:
- number of distinct values
- number of NULL values
- min/max k values where k could be given by user
- histogram: frequency and height balanced
- average size of the column
- avg/sum of all values in the column if their type is numerical
- percentiles of the value
> column level statistics
> -----------------------
>
> Key: HIVE-1362
> URL: https://issues.apache.org/jira/browse/HIVE-1362
> Project: Hadoop Hive
> Issue Type: Sub-task
> Reporter: Ning Zhang
> Assignee: Ahmed M Aly
>
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