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https://issues.apache.org/jira/browse/HIVE-22978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17052632#comment-17052632
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Jesus Camacho Rodriguez commented on HIVE-22978:
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[~vgarg], can you take a look?
https://github.com/apache/hive/pull/938
To be clear, it is expected to have additional CAST expressions to match AVG
type semantics.
> Fix decimal precision and scale inference for aggregate rewriting in Calcite
> ----------------------------------------------------------------------------
>
> Key: HIVE-22978
> URL: https://issues.apache.org/jira/browse/HIVE-22978
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22978.01.patch, HIVE-22978.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Calcite rules can do rewritings of aggregate functions, e.g., {{avg}} into
> {{sum/count}}. When type of {{avg}} is decimal, inference of intermediate
> precision and scale for the division is not done correctly. The reason is
> that we miss support for some types in method {{getDefaultPrecision}} in
> {{HiveTypeSystemImpl}}. Additionally, {{deriveSumType}} should be overridden
> in {{HiveTypeSystemImpl}} to abide by the Hive semantics for sum aggregate
> type inference.
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