GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/13090
[SPARK-15308][SQL] RowEncoder should preserve nested column name.
## What changes were proposed in this pull request?
The following code generates wrong schema:
```
val schema = new StructType().add(
"struct",
new StructType()
.add("i", IntegerType, nullable = false)
.add(
"s",
new StructType().add("int", IntegerType, nullable = false),
nullable = false),
nullable = false)
val ds = sqlContext.range(10).map(l => Row(l, Row(l)))(RowEncoder(schema))
ds.printSchema()
```
This should print as follows:
```
root
|-- struct: struct (nullable = false)
| |-- i: integer (nullable = false)
| |-- s: struct (nullable = false)
| | |-- int: integer (nullable = false)
```
but the result is:
```
|-- struct: struct (nullable = false)
| |-- col1: integer (nullable = false)
| |-- col2: struct (nullable = false)
| | |-- col1: integer (nullable = false)
```
This PR fixes `RowEncoder` to preserve nested column name.
## How was this patch tested?
Existing tests and I added a test to check if `RowEncoder` preserves nested
column name.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark issues/SPARK-15308
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13090.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 #13090
----
commit d4ae79775f2ba0ebd0dd65b52076930244c2be96
Author: Takuya UESHIN <[email protected]>
Date: 2016-05-13T04:02:41Z
Add a test to check if RowEncoder preserves nested column name.
commit ddb9ce6692d9b70b7656196191d3572696ee0a12
Author: Takuya UESHIN <[email protected]>
Date: 2016-05-13T04:08:00Z
Fix RowEncoder to preserve nested column name.
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