Github user maropu commented on the issue:
https://github.com/apache/spark/pull/18200
Sorry for interrupting you though, is this a blocker for the v2.2 release?
It seems v2.1 accepts this case:
```
#cat test.csv
1,3
1
#./bin/spark-shell
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 2.1.0
/_/
Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java
1.8.0_31)
Type in expressions to have them evaluated.
Type :help for more information.
scala> import org.apache.spark.sql.types._
import org.apache.spark.sql.types._
scala> spark.read.schema(new StructType().add("a", IntegerType).add("b",
IntegerType)).csv("/Users/maropu/Desktop/test.csv").show
+---+----+
| a| b|
+---+----+
| 1| 3|
| 1|null|
+---+----+
```
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