GitHub user ala opened a pull request:
https://github.com/apache/spark/pull/16829
[SPARK-19447] Fixing input metrics for range operator.
## What changes were proposed in this pull request?
This change introduces a new metric "number of generated rows". It is used
exclusively for Range, which is a leaf in the query tree, yet doesn't read any
input data, and therefore cannot report "recordsRead".
Additionally the way in which the metrics are reported by the JIT-compiled
version of Range was changed. Previously, it was immediately reported that all
the records were produced. This could be confusing for a user monitoring
execution progress in the UI. Now, the metric is updated gradually.
In order to avoid negative impact on Range performance, the code generation
was reworked. The values are now produced in batches in the tighter inner loop,
while the metrics are updated in the outer loop.
The change also contains a number of unit tests, which should help ensure
the correctness of metrics for various input sources.
## How was this patch tested?
Unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ala/spark SPARK-19447
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16829.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #16829
----
commit aa6892a320dc098d8c3c517bed7caaa642059c17
Author: Ala Luszczak <a...@databricks.com>
Date: 2017-02-03T16:25:51Z
[SPARK-19447] Fixing input metrics for range operator.
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