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https://issues.apache.org/jira/browse/SPARK-11371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14985651#comment-14985651
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Yin Huai commented on SPARK-11371:
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Since DataFrame API provides it as a function, I think it is fine to add it in
function registry.
> Make "mean" an alias for "avg" operator
> ---------------------------------------
>
> Key: SPARK-11371
> URL: https://issues.apache.org/jira/browse/SPARK-11371
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Ted Yu
> Priority: Minor
> Attachments: spark-11371-v1.patch
>
>
> From Reynold in the thread 'Exception when using some aggregate operators'
> (http://search-hadoop.com/m/q3RTt0xFr22nXB4/):
> I don't think these are bugs. The SQL standard for average is "avg", not
> "mean". Similarly, a distinct count is supposed to be written as
> "count(distinct col)", not "countDistinct(col)".
> We can, however, make "mean" an alias for "avg" to improve compatibility
> between DataFrame and SQL.
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