GitHub user ericl opened a pull request:
https://github.com/apache/spark/pull/12025
[SPARK-14227] [SQL] Add method for printing out generated code for debugging
## What changes were proposed in this pull request?
This adds `debugCodegen` to the debug package for query execution.
## How was this patch tested?
Unit and manual testing. Output example:
```
scala>
sqlContext.range(100).groupBy("id").count().orderBy("id").debugCodegen().toString
Found 3 WholeStageCodegen subtrees.
== Subtree 1 / 3 ==
WholeStageCodegen
: +- TungstenAggregate(key=[id#42L],
functions=[(count(1),mode=Final,isDistinct=false)], output=[id#42L,count#46L])
: +- INPUT
+- Exchange hashpartitioning(id#42L, 200), None
+- WholeStageCodegen
: +- TungstenAggregate(key=[id#42L],
functions=[(count(1),mode=Partial,isDistinct=false)], output=[id#42L,count#51L])
: +- Range 0, 1, 1, 100, [id#42L]
Generated code:
/* 001 */ public Object generate(Object[] references) {
/* 002 */ return new GeneratedIterator(references);
/* 003 */ }
/* 004 */
```
@rxin
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ericl/spark spark-14227
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12025.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 #12025
----
commit da873835dc430bbc119180f2b29b6e0959456b61
Author: Eric Liang <e...@databricks.com>
Date: 2016-03-29T02:58:39Z
Mon Mar 28 19:58:39 PDT 2016
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