Yin Huai created SPARK-9422:
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Summary: Remove the placeholder attributes used in the aggregation
buffers
Key: SPARK-9422
URL: https://issues.apache.org/jira/browse/SPARK-9422
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Yin Huai
Assignee: Yin Huai
Originally, to merge two aggregation buffers, we create a mutable buffer with
extra placeholder attributes to represent grouping expressions (because the
input aggregation buffer has grouping keys). This was done to make the first
implementation easy. We can remove it now, which can also help us to implement
the hash aggregate operator using unsafe row as the buffer.
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