Shaofeng SHI created KYLIN-980:
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Summary: FactDistinctColumnsJob need be optimized to support high
cardinality columns
Key: KYLIN-980
URL: https://issues.apache.org/jira/browse/KYLIN-980
Project: Kylin
Issue Type: Improvement
Affects Versions: v0.7.2
Reporter: Shaofeng SHI
Assignee: Shaofeng SHI
In FactDistinctColumnsJob's combiner and reducer, it uses a HashSet to remove
the duplicated values; But if a column's cardinality is very big, say > 10
Million, it may reports OutOfMemory error;
It should be enhanced to support such case.
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