GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/12099
[SPARK-14251][SQL] Add SQL command for printing out generated code for
debugging
## What changes were proposed in this pull request?
This PR implements `EXPLAIN CODEGEN` SQL command. In short, this command do
the `explain` and `debugCodegen` at one command. For example,
* (1) `sql("explain extended select 'a' as a group by
1").collect().foreach(println)`
* (2) `sql("select 'a' as a group by 1").debugCodegen()`
* (1+2: This PR) `sql("explain extended codegen select 'a' as a group by
1").collect().foreach(println)`
**Before**
```
scala> import org.apache.spark.sql.execution.debug._
scala> sql("explain extended select 'a' as a group by
1").collect().foreach(println)
[== Parsed Logical Plan ==]
...
[== Analyzed Logical Plan ==]
...
[== Optimized Logical Plan ==]
...
[== Physical Plan ==]
...
scala> sql("select 'a' as a group by 1").debugCodegen()
Found 2 WholeStageCodegen subtrees.
== Subtree 1 / 2 ==
...
Generated code:
...
== Subtree 2 / 2 ==
...
Generated code:
...
```
**After**
```
scala> sql("explain extended codegen select 'a' as a group by
1").collect().foreach(println)
[== Parsed Logical Plan ==]
...
[== Analyzed Logical Plan ==]
...
[== Optimized Logical Plan ==]
...
[== Physical Plan ==]
...
[]
[Found 2 WholeStageCodegen subtrees.]
[== Subtree 1 / 2 ==]
...
[]
[Generated code:]
...
[]
[== Subtree 2 / 2 ==]
...
[]
[Generated code:]
...
```
## How was this patch tested?
Pass the Jenkins tests (including new testcases)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-14251
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12099.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 #12099
----
commit 4e750e5cfecc8b1ac70c788c5811bc947d8acccb
Author: Dongjoon Hyun <[email protected]>
Date: 2016-03-31T18:33:30Z
[SPARK-14251][SQL] Add SQL command for printing out generated code for
debugging
----
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