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https://issues.apache.org/jira/browse/HIVE-362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688827#action_12688827
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Raghotham Murthy commented on HIVE-362:
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In your example, even with NULLs, SUM(a) / COUNT(a) will be the same as AVG(a).
This is because COUNT(a) returns the number of rows which have non-null 'a'.
This is different from COUNT(*) which returns the count of all rows.
> avg() returns null if any item in the list is null; create function that
> doesn't
> --------------------------------------------------------------------------------
>
> Key: HIVE-362
> URL: https://issues.apache.org/jira/browse/HIVE-362
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Adam Kramer
>
> Some of the current aggregates (sum, avg) have a fairly standard behavior: If
> any item in the list is NULL, the sum, average, etc., cannot be computed. And
> so, NULL is returned.
> 1) If this is the case, the query should return much faster--see a null,
> return NULL, exit(0).
> 2) It would be nice to have versions or ways to use these functions with NULL
> data--specifically, to treat the NULL as zero or to ignore the NULL and
> return the results for non-NULL data.
> This also would apply to the variance functions referenced in
> https://issues.apache.org/jira/browse/HIVE-165
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