Two Bugs for Estimating Row Sizes in GroupByOperator
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Key: HIVE-1737
URL: https://issues.apache.org/jira/browse/HIVE-1737
Project: Hive
Issue Type: Bug
Reporter: Siying Dong
Assignee: Siying Dong
Two bugs:
1. if UDAF uses string type, Group-by will break as it tries to insert an
ArrayList<Object> to a HashMap<KeyWrapper, AggregationBuffer[]>.
2. The code to sample size of keys only handles String type and Text type,
while in most cases, they are org.apache.hadoop.hive.serde2.lazy.LazyString, so
that 0 is always used.
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