[jira] [Created] (IMPALA-7878) Bad SQL generated by compute incremental stats

["Pooja Nilangekar (JIRA)" <ji...@apache.org>]

Pooja Nilangekar created IMPALA-7878:
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             Summary: 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
            Assignee: Paul Rogers


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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