GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/19105
[SPARK-21897][PYTHON][R] Add unionByName API to DataFrame in Python and R
## What changes were proposed in this pull request?
This PR proposes to add a wrapper for `unionByName` API to R and Python as
well.
**Python**
```python
df1 = spark.createDataFrame([[1, 2, 3]], ["col0", "col1", "col2"])
df2 = spark.createDataFrame([[4, 5, 6]], ["col1", "col2", "col0"])
df1.unionByName(df2).show()
```
```
+----+----+----+
|col0|col1|col3|
+----+----+----+
| 1| 2| 3|
| 6| 4| 5|
+----+----+----+
```
**R**
```R
df1 <- select(createDataFrame(mtcars), "carb", "am", "gear")
df2 <- select(createDataFrame(mtcars), "am", "gear", "carb")
head(union(limit(df1, 2), limit(df2, 2)))
```
```
carb am gear
1 4 1 4
2 4 1 4
3 4 1 4
4 4 1 4
```
## How was this patch tested?
Doctests for Python and unit test added in `test_sparkSQL.R` for R.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark unionByName-r-python
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19105.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 #19105
----
commit 058feeb4a56fdb81566de90cd7a5bcbe03bc5486
Author: hyukjinkwon <[email protected]>
Date: 2017-09-02T00:53:54Z
Add unionByName API to DataFrame in Python and R
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