Github user drubbo commented on the pull request:
https://github.com/apache/spark/pull/6193#issuecomment-102952370
This for instance: in [SparkGIS](https://github.com/drubbo/SparkGIS) we're
adding support for geometry types that may be serialized in GeoJSON format, so
that we'd like to do the following inside a Spark application:
val schema = StructType(Seq(
StructField("id", IntegerType),
StructField("geo", GeometryType.Instance)
))
val rdd = sparkContext.parallelize(Seq(
"{\"id\":1,\"geo\":{\"type\":\"Point\",\"coordinates\":[1,1]}}",
"{\"id\":2,\"geo\":{\"type\":\"LineString\",\"coordinates\":[[12,13],[15,20]]}}"
))
val df = sqlContext.jsonRDD(rdd, schema) // here the schema is enforced
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