GitHub user clockfly opened a pull request:
https://github.com/apache/spark/pull/13651
[SPARK-15776][SQL] Divide Expression inside Aggregation function is casted
to wrong type
## What changes were proposed in this pull request?
This PR fixes the problem that Divide Expression inside Aggregation
function is casted to wrong type. After the fix, the behavior is consistent
with Hive.
**Before the change:**
```
scala> sql("select sum(1 / 2) as a").schema
res4: org.apache.spark.sql.types.StructType =
StructType(StructField(a,LongType,true))
scala> sql("select sum(1 / 2) as a").show()
+---+
| a|
+---+
|0 |
+---+
```
**After the change:**
```
scala> sql("select sum(1 / 2) as a").schema
res4: org.apache.spark.sql.types.StructType =
StructType(StructField(a,DoubleType,true))
scala> sql("select sum(1 / 2) as a").show()
+---+
| a|
+---+
|0.5|
+---+
```
## How was this patch tested?
Unit test.
This PR is based on https://github.com/apache/spark/pull/13524 by
@Sephiroth-Lin
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/clockfly/spark SPARK-15776
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13651.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 #13651
----
commit df08eeacd85187ca5a71463fc5d25f63426ebe84
Author: Sean Zhong <[email protected]>
Date: 2016-06-13T22:09:20Z
SPARK-15776 Divide Expression inside an Aggregation function is casted to
wrong type
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