Yin Huai created SPARK-16633:
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Summary: lag/lead does not return the default value when the
offset row does not exist
Key: SPARK-16633
URL: https://issues.apache.org/jira/browse/SPARK-16633
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.0
Reporter: Yin Huai
Priority: Critical
Please see the attached notebook. Seems lag/lead somehow fail to recognize that
a offset row does not exist.
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