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https://issues.apache.org/jira/browse/IMPALA-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers reassigned IMPALA-7878:
-----------------------------------
Assignee: (was: Paul Rogers)
> Bad SQL generated by compute incremental stats
> -----------------------------------------------
>
> Key: IMPALA-7878
> URL: https://issues.apache.org/jira/browse/IMPALA-7878
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Reporter: Pooja Nilangekar
> Priority: Major
>
> Computing incremental stats on partitions generates bad sql for instance:
> For a table foo partitioned by column bar, the compute stats statement:
> {code:java}
> compute incremental stats foo partition (bar = 1);
> {code}
> would generate the following query:
> {code:java}
> SELECT COUNT(*), month FROM foo WHERE (bar=1) GROUP BY bar;
> {code}
> If this were to be rewritten as follows, it would produce fewer fragments and
> hence also reduce query memory by avoiding a hash aggregation node.
> {code:java}
> SELECT COUNT(*), 1 FROM foo WHERE bar=1;
> {code}
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