slim bouguerra created HIVE-19923:
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Summary: Follow up of HIVE-19615, use UnaryFunction instead of
prefix
Key: HIVE-19923
URL: https://issues.apache.org/jira/browse/HIVE-19923
Project: Hive
Issue Type: Sub-task
Reporter: slim bouguerra
Correct usage of Druid isnull function is {code} isnull(exp){code}
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