GitHub user marmbrus opened a pull request:
https://github.com/apache/spark/pull/1005
[SQL] Simple framework for debugging query execution
Only records number of tuples and unique dataTypes output right now...
Example:
```scala
scala> import org.apache.spark.sql.execution.debug._
scala> hql("SELECT value FROM src WHERE key > 10").debug(sparkContext)
Results returned: 489
== Project [value#1:0] ==
Tuples output: 489
value StringType: {java.lang.String}
== Filter (key#0:1 > 10) ==
Tuples output: 489
value StringType: {java.lang.String}
key IntegerType: {java.lang.Integer}
== HiveTableScan [value#1,key#0], (MetastoreRelation default, src, None),
None ==
Tuples output: 500
value StringType: {java.lang.String}
key IntegerType: {java.lang.Integer}
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/marmbrus/spark debug
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1005.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 #1005
----
commit c9dded265881a8fabc46064255964c0e4af3f4d8
Author: Michael Armbrust <[email protected]>
Date: 2014-06-07T10:33:02Z
Simple framework for debugging query execution
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