Reynold Xin created SPARK-8216:
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Summary: math function: rename log -> ln
Key: SPARK-8216
URL: https://issues.apache.org/jira/browse/SPARK-8216
Project: Spark
Issue Type: Sub-task
Reporter: Reynold Xin
Rename expression Log -> Ln.
Also create aliased data frame functions, and update FunctionRegistry.
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