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Commit b10af5e2 authored by Davies Liu's avatar Davies Liu Committed by Reynold Xin
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[SPARK-12915][SQL] add SQL metrics of numOutputRows for whole stage codegen

This PR add SQL metrics (numOutputRows) for generated operators (same as non-generated), the cost is about 0.2 nano seconds per row.

<img width="806" alt="gen metrics" src="https://cloud.githubusercontent.com/assets/40902/12994694/47f5881e-d0d7-11e5-9d47-78229f559ab0.png">

Author: Davies Liu <davies@databricks.com>

Closes #11170 from davies/gen_metric.
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