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https://issues.apache.org/jira/browse/IMPALA-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aman Sinha reassigned IMPALA-3858:
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Assignee: Aman Sinha
> Allow for grouping of analytic nodes with matching 'order by' prefixes
> ----------------------------------------------------------------------
>
> Key: IMPALA-3858
> URL: https://issues.apache.org/jira/browse/IMPALA-3858
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 2.7.0
> Reporter: Thomas Tauber-Marshall
> Assignee: Aman Sinha
> Priority: Minor
> Labels: performance
>
> Currently, AnalyticPlanner.isCompatible checks that analytic function's order
> by clauses are identical before allowing them to be grouped in the same
> analytic node.
> For many cases, it should be sufficient that they simply have matching
> prefixes, even if one of them may be ordered on additional columns that the
> other isn't, eg: functions with ordering 'order by: int_col ASC' and 'order
> by: int_col ASC, bool_col DESC' may be compatible.
> There may be cases where this is not true, such as for RANGES windows, so we
> need to be careful when we apply this optimization.
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