LazySimpleSerDe to directly serialize (append) int/long/byte/short etc to UTF-8
buffer
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Key: HIVE-375
URL: https://issues.apache.org/jira/browse/HIVE-375
Project: Hadoop Hive
Issue Type: Improvement
Affects Versions: 0.3.0
Reporter: Zheng Shao
LazySimpleSerDe currently serialize all data into a StringBuilder, and then
convert it to String and then Text.
Even if the data is of type int/long/byte/short, we still do that unnecessary
conversion.
We should directly serialize/append int/long/byte/short to a UTF-8 buffer.
This is a very simple change, but it is expected to save 2-3% of the time of a
typical mapper (on a group-by query with some int/long columns).
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