[jira] [Created] (KYLIN-2657) Cube merge TopN dictionary not found, cause NPE

[Roger Shi (JIRA)]

Roger Shi created KYLIN-2657:
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             Summary: Cube merge TopN dictionary not found, cause NPE
                 Key: KYLIN-2657
                 URL: https://issues.apache.org/jira/browse/KYLIN-2657
             Project: Kylin
          Issue Type: Bug
            Reporter: Roger Shi
            Assignee: Roger Shi


One TopN measure with two group-by columns, and both of them are in fact table. 
If one cardinality is high and the other is low, merging Cube may fail for NPE 
(dict not found).



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