GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/14096
[SPARK-16425][R] `describe()` should consider numeric/string-type columns
## What changes were proposed in this pull request?
This PR prevents ERRORs when `summary(df)` is called for `SparkDataFrame`
with not-numeric or non-string columns. This failure happens only in `SparkR`.
**Before**
```r
> df <- createDataFrame(faithful)
> df <- withColumn(df, "boolean", df$waiting==79)
> summary(df)
16/07/07 14:15:16 ERROR RBackendHandler: describe on 34 failed
Error in invokeJava(isStatic = FALSE, objId$id, methodName, ...) :
org.apache.spark.sql.AnalysisException: cannot resolve 'avg(`boolean`)'
due to data type mismatch: function average requires numeric types, not
BooleanType;
```
**After**
```r
> df <- createDataFrame(faithful)
> df <- withColumn(df, "boolean", df$waiting==79)
> summary(df)
SparkDataFrame[summary:string, eruptions:string, waiting:string]
```
## How was this patch tested?
Pass the Jenkins with a updated testcase.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-16425
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14096.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 #14096
----
commit f0bd1d63f5aa4b1ad812a083563409308fab3d42
Author: Dongjoon Hyun <[email protected]>
Date: 2016-07-07T21:57:59Z
[SPARK-16425][R] `describe()` should consider numeric/string-type columns
----
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