GitHub user clockfly opened a pull request:
https://github.com/apache/spark/pull/13535
[SPARK-15792][SQL] Allows operator to change the verbosity in explain output
## What changes were proposed in this pull request?
This PR allows customization of verbosity in explain output.
After change, `dataframe.explain()` and `dataframe.explain(true)` has
different verbosity output for physical plan.
**For dataframe.explain(extended = false):**
`output=[count(a)#85L]` is **NOT** displayed for physical plan.
```
scala> Seq((1,2,3)).toDF("a", "b", "c").createTempView("df2")
scala> spark.sql("select count(a) from df2").explain()
== Physical Plan ==
*HashAggregate(key=[], functions=[count(1)])
+- Exchange SinglePartition
+- *HashAggregate(key=[], functions=[partial_count(1)])
+- LocalTableScan
```
**For dataframe.explain(extended = true):**
`output=[count(a)#85L]` is displayed for physical plan.
```
scala> spark.sql("select count(a) from df2").explain(true) //
"output=[count(a)#85L]" is added
...
== Physical Plan ==
*HashAggregate(key=[], functions=[count(1)], output=[count(a)#85L])
+- Exchange SinglePartition
+- *HashAggregate(key=[], functions=[partial_count(1)],
output=[count#87L])
+- LocalTableScan
```
## How was this patch tested?
Manual test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/clockfly/spark verbose_breakdown_2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13535.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 #13535
----
commit 1e1e4418003cc13b0e2a118a315f6aa2422c3f14
Author: Sean Zhong <[email protected]>
Date: 2016-05-27T18:54:36Z
Improve the aggregate output.
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