Cheng Hao created SPARK-4233:
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Summary: Simplify the Aggregation Function implementation
Key: SPARK-4233
URL: https://issues.apache.org/jira/browse/SPARK-4233
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Cheng Hao
Currently, the UDAF implementation is quite complicated, and we have to provide
distinct & non-distinct version.
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