Fucun Chu created IMPALA-10687:
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             Summary: Implement ds_cpc_union() function
                 Key: IMPALA-10687
                 URL: https://issues.apache.org/jira/browse/IMPALA-10687
             Project: IMPALA
          Issue Type: New Feature
            Reporter: Fucun Chu
            Assignee: Fucun Chu


Similarly to https://issues.apache.org/jira/browse/IMPALA-9633 DataSketches CPC 
also has union functionality.

ds_cpc_union() expects a dataset of STRINGs (e.g. column of a table) that 
represents serialized CPC sketches and returns a single STRING that is the 
received sketches unioned and serialized.



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