reduce the usage of HashMap and List.iterator.
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Key: HIVE-1472
URL: https://issues.apache.org/jira/browse/HIVE-1472
Project: Hadoop Hive
Issue Type: Improvement
Reporter: He Yongqiang
Priority: Minor
HashMap is used in a lot of places in Hive. Most times we can just replace it
with native array. List.iterator() give a lot of pressure to Java GC, we should
avoid it.
Another thing we can also try here is to replace GroupByOperator's HashMap look
up by not using the ObjectInspectorUtils.compare(). Instead, We can try here is
to first serialize the keys and use the serialized bytes to do the comparison.
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