Github user nongli commented on the pull request:
https://github.com/apache/spark/pull/10833#issuecomment-172959182
This was explicitly not done. See this benchmark:
https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/execution/vectorized/ColumnarBatchBenchmark.scala#L314
Memory footprint is not the biggest concern for this component. It's not
clear to me this is a better approach.
Why should we do this?
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