Yin Huai created HIVE-4877:
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Summary: In ExecReducer, remove tag from the row which will be
passed to the first Operator at the Reduce-side
Key: HIVE-4877
URL: https://issues.apache.org/jira/browse/HIVE-4877
Project: Hive
Issue Type: Improvement
Reporter: Yin Huai
In ExecReducer, we can see ...
{code}
row.clear();
row.add(keyObject);
row.add(valueObject[tag.get()]);
// The tag is not used any more, we should remove it.
row.add(tag);
{\code}
I have seen this for a long time. Actually, we are using
{code}
reducer.process(row, tag.get());
{\code}
to pass the tag.
If we do not need to add the tag to a row, we should remove it.
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