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https://issues.apache.org/jira/browse/HAWQ-1404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleksandr Diachenko reassigned HAWQ-1404:
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Assignee: Oleksandr Diachenko (was: Ed Espino)
> PXF to leverage file-level stats of ORC file and emit records for COUNT(*)
> --------------------------------------------------------------------------
>
> Key: HAWQ-1404
> URL: https://issues.apache.org/jira/browse/HAWQ-1404
> Project: Apache HAWQ
> Issue Type: Improvement
> Components: PXF
> Reporter: Oleksandr Diachenko
> Assignee: Oleksandr Diachenko
>
> For cases when user issues COUNT(*) queries without WHERE clause PXF should
> be able to leverage file-level stats for a ORC file and emit given number of
> records back to HAWQ, avoiding reading actual tuples from disk. This should
> be a first step in enabling PXF to use ORC stats(file, stripe and row group
> levels) so we can improve a wider range of aggregate queries.
> So whenever PXF receives "count" as AGG-TYPE parameters value - it should
> optimize it by emitting tuples using ORC file-level stats.
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