Rajesh Balamohan created HIVE-8158:
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Summary: Optimize writeValue/setValue in
VectorExpressionWriterFactory (in VectorReduceSinkOperator codepath)
Key: HIVE-8158
URL: https://issues.apache.org/jira/browse/HIVE-8158
Project: Hive
Issue Type: Bug
Reporter: Rajesh Balamohan
Assignee: Rajesh Balamohan
VectorReduceSinkOperator --> ProcessOp --> makeValueWriatable -->
VectorExpressionWriterFactory --> writeValue(byte[], int, int) /setValue.
It appears that this goes through an additional layer of Text.encode/decode
causing CPU pressure (profiler output attached).
SettableStringObjectInspector / WritableStringObjectInspector has "set(Object
o, Text value)" method. It would be beneficial to use set(Object, Text)
directly to save CPU cycles.
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