Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/14124
Oh, I see, before this patch
```
+---+
| a|
+---+
| 1|
| 0|
+---+
```
after this patch
```
+----+
| a|
+----+
| 1|
|null|
+----+
```
FYI, currently (before this patch) the code below
```scala
val rdd = spark.sparkContext.makeRDD(Seq("{\"a\" : 1}", "{\"a\" : null}"))
val schema = StructType(StructField("a", StringType, nullable = false) ::
Nil)
val df = spark.read.schema(schema).json(rdd)
df.show()
```
is being failed with the exception below:
```
Error while decoding: java.lang.NullPointerException
createexternalrow(input[0, string, false].toString,
StructField(a,StringType,false))
+- input[0, string, false].toString
+- input[0, string, false]
java.lang.RuntimeException: Error while decoding:
java.lang.NullPointerException
createexternalrow(input[0, string, false].toString,
StructField(a,StringType,false))
+- input[0, string, false].toString
+- input[0, string, false]
at
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder.fromRow(ExpressionEncoder.scala:292)
at
org.apache.spark.sql.Dataset$$anonfun$org$apache$spark$sql$Dataset$$execute$1$1$$anonfun$apply$15.apply(Dataset.scala:2218)
at
org.apache.spark.sql.Dataset$$anonfun$org$apache$spark$sql$Dataset$$execute$1$1$$anonfun$apply$15.apply(Dataset.scala:2218)
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
...
```
It seems unexpected behaviour anyway. I will submit a patch if this one is
decided not worth being added. Thanks @gatorsmile again!
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