Sun Rui created SPARK-11209:
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Summary: Add window functions into SparkR [step 1]
Key: SPARK-11209
URL: https://issues.apache.org/jira/browse/SPARK-11209
Project: Spark
Issue Type: Bug
Components: SparkR
Affects Versions: 1.5.1
Reporter: Sun Rui
Add the following 4 window functions into SparkR:
lead
cumuDist
lag
ntile
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