GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/15361
[SPARK-17765][SQL] Support for writing out user-defined type in ORC
datasource
## What changes were proposed in this pull request?
`OrcStruct` is being created based on string from`DataType.catalogString`.
For user-defined type, it seems it returns `sqlType.simpleString` for
`catalogString` by default[1]. However, during type-dispatching to match the
output with the schema, it tries to cast to, for example, `StructType`[2].
So, running the codes below (`MyDenseVector` was borrowed[3]) :
```scala
val data = Seq((1, new UDT.MyDenseVector(Array(0.25, 2.25, 4.25))))
val udtDF = data.toDF("id", "vectors")
udtDF.write.orc("/tmp/test.orc")
```
ends up throwing an exception as below:
```
java.lang.ClassCastException: org.apache.spark.sql.UDT$MyDenseVectorUDT
cannot be cast to org.apache.spark.sql.types.ArrayType
at
org.apache.spark.sql.hive.HiveInspectors$class.wrapperFor(HiveInspectors.scala:381)
at
org.apache.spark.sql.hive.orc.OrcSerializer.wrapperFor(OrcFileFormat.scala:164)
...
```
[1]https://github.com/apache/spark/blob/dfdcab00c7b6200c22883baa3ebc5818be09556f/sql/catalyst/src/main/scala/org/apache/spark/sql/types/UserDefinedType.scala#L95
[2]https://github.com/apache/spark/blob/d2dc8c4a162834818190ffd82894522c524ca3e5/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveInspectors.scala#L326
[3]https://github.com/apache/spark/blob/2bfed1a0c5be7d0718fd574a4dad90f4f6b44be7/sql/core/src/test/scala/org/apache/spark/sql/UserDefinedTypeSuite.scala#L38-L70
## How was this patch tested?
Unit tests in `OrcQuerySuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-17765
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15361.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 #15361
----
commit 948a5ca6204460bda0eeefc85ca326c626a707f8
Author: hyukjinkwon <[email protected]>
Date: 2016-10-05T10:27:54Z
Support for writing out user-defined type in ORC datasource
----
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