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https://issues.apache.org/jira/browse/IMPALA-10495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Qifan Chen updated IMPALA-10495:
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Description: Selecting good min/max filters for a query during query
compilation can be a difficult task as the benefit of such a filter may not be
known. However, when a column C is known to have a strong correlation with a
partition or a sort column, a min/max filter on C can be chosen and very
useful. (was: Selecting good min/max filters for a query during query
compilation can be a difficult task as the benefit of such a filter may not
known. However, when a column C is known to have a strong correlation with a
partition or a sort column, a min/max filter on C can be very useful.)
> Computing correlation coefficient for certain columns can be useful to
> min/max filters
> --------------------------------------------------------------------------------------
>
> Key: IMPALA-10495
> URL: https://issues.apache.org/jira/browse/IMPALA-10495
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Qifan Chen
> Priority: Major
>
> Selecting good min/max filters for a query during query compilation can be a
> difficult task as the benefit of such a filter may not be known. However,
> when a column C is known to have a strong correlation with a partition or a
> sort column, a min/max filter on C can be chosen and very useful.
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