Cheng Hao created SPARK-4093:
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Summary: Simplify the unwrap/wrap between HiveUDFs
Key: SPARK-4093
URL: https://issues.apache.org/jira/browse/SPARK-4093
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Cheng Hao
Priority: Minor
Currently, the nested Hive UDFs invoking will cause extra overhead in
"unwrapping" / "wrapping" data.
e.g.
SELECT cos(sin(a)) FROM t;
We can reuse the ObjectInspector & output result of nested Hive UDF(sin), and
avoid the extra data "unwrap" and "wrap".
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