GitHub user dilipbiswal opened a pull request:
https://github.com/apache/spark/pull/13045
[SPARK-15114][SQL] Column name generated by typed aggregate is super verbose
## What changes were proposed in this pull request?
Generate a shorter default alias for `AggregateExpression `, In this PR,
aggregate function name along with a index is used for generating the alias
name.
```SQL
val ds = Seq(1, 3, 2, 5).toDS()
ds.select(typed.sum((i: Int) => i), typed.avg((i: Int) => i)).show()
```
Output before change.
```SQL
+-----------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
|typedsumdouble(unresolveddeserializer(upcast(input[0, int], IntegerType, -
root class: "scala.Int"), value#1),
upcast(value))|typedaverage(unresolveddeserializer(upcast(input[0, int],
IntegerType, - root class: "scala.Int"), value#1), newInstance(class
scala.Tuple2))|
+-----------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
|
11.0|
2.75|
+-----------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
```
Output after change:
```SQL
+-----------------+---------------+
|typedsumdouble_c1|typedaverage_c2|
+-----------------+---------------+
| 11.0| 2.75|
+-----------------+---------------+
```
Note: There is one test in ParquetSuites.scala which shows that that the
system picked alias
name is not usable and is rejected.
[test](https://github.com/apache/spark/blob/master/sql/hive/src/test/scala/org/apache/spark/sql/hive/parquetSuites.scala#L672-#L687)
## How was this patch tested?
A new test was added in DataSetAggregatorSuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dilipbiswal/spark spark-15114
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13045.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 #13045
----
commit 65375b41605ebe8d506a11e255ee5b1efa54e36d
Author: Dilip Biswal <[email protected]>
Date: 2016-05-10T23:33:30Z
[SPARK-15114] Column name generated by typed aggregate is super verbose
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