Gopal V created HIVE-15573:
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Summary: Vectorization: ACID shuffle ReduceSink is not specialized
Key: HIVE-15573
URL: https://issues.apache.org/jira/browse/HIVE-15573
Project: Hive
Issue Type: Improvement
Components: Transactions, Vectorization
Affects Versions: 2.2.0
Reporter: Gopal V
The ACID shuffle disabled murmur hash for the shuffle, due to the bucketing
requirements demanding the writable hashcode for the shuffles.
{code}
boolean useUniformHash = desc.getReducerTraits().contains(UNIFORM);
if (!useUniformHash) {
return false;
}
{code}
This check protects the fast ReduceSink ops from being used in ACID inserts.
A specialized case for the following pattern will make ACID insert much faster.
{code}
Reduce Output Operator
sort order:
Map-reduce partition columns: _col0 (type: bigint)
value expressions: ....
{code}
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