GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/11752
[SPARK-3308][SQL][FOLLOW-UP] Parse JSON rows having an array type and a
struct type in the same fieild
## What changes were proposed in this pull request?
This https://github.com/apache/spark/pull/2400 added the support to parse
JSON rows wrapped with an array. However, when the given data contains array
data and struct data in the same field as below:
```json
{"a": {"b": 1}}
{"a": []}
```
and the schema is given as below:
```scala
val schema =
StructType(
StructField("a", StructType(
StructField("b", StringType) :: Nil
)) :: Nil)
```
This throws an exception below:
```java
Exception in thread "main" org.apache.spark.SparkException: Job aborted due
to stage failure: Task 7 in stage 0.0 failed 4 times, most recent failure: Lost
task 7.3 in stage 0.0 (TID 10, 192.168.1.170): java.lang.ClassCastException:
org.apache.spark.sql.types.GenericArrayData cannot be cast to
org.apache.spark.sql.catalyst.InternalRow
at
org.apache.spark.sql.catalyst.expressions.BaseGenericInternalRow$class.getStruct(rows.scala:50)
at
org.apache.spark.sql.catalyst.expressions.GenericMutableRow.getStruct(rows.scala:247)
at
org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificPredicate.eval(Unknown
Source)
...
```
For other data types, in this case it converts the given values are `null`
but only this case emits an exception.
This PR makes the support for wrapped rows applied only at the top level.
## How was this patch tested?
Unit tests were used and `./dev/run_tests` for code style tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-3308-follow-up
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11752.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 #11752
----
commit 4ab1e80e8bca868fc2387cf74004cc44b6e4664a
Author: hyukjinkwon <gurwls...@gmail.com>
Date: 2016-03-16T04:36:56Z
Parse JSON rows having an array type and a struct type in the same field.
----
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