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https://issues.apache.org/jira/browse/IMPALA-15059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18110184#comment-18110184
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Aleksandr Efimov commented on IMPALA-15059:
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[~stigahuang] are you working on this, or planning to? If it is free, I would
like to pick it up
> Use HBO stats in calcite planner
> --------------------------------
>
> Key: IMPALA-15059
> URL: https://issues.apache.org/jira/browse/IMPALA-15059
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Reporter: Quanlong Huang
> Assignee: Quanlong Huang
> Priority: Major
>
> HBO stats are fetched in Impala PlanNodes, e.g. in HdfsScanNode.init() ->
> computeStats() -> computeCardinalities(), which is too late for calcite
> optimizations to leverage them.
>
> We need to integrate HBO with calcite planner by fetching HBO stats in places
> like
> ImpalaRelMdRowCount.
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