Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18236
It looks we already throw the same exception with what this PR proposes as
below:
```scala
import org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema
import org.apache.spark.sql.types._
val schema = StructType(
StructField("col1", StringType) ::
StructField("col2", StringType) ::
StructField("col3", IntegerType) :: Nil)
val values = Array("value1", "value2", 1)
val sampleRow = new GenericRowWithSchema(values, schema)
sampleRow.fieldIndex(null)
```
```
java.lang.IllegalArgumentException: Field "null" does not exist.
at
org.apache.spark.sql.types.StructType$$anonfun$fieldIndex$1.apply(StructType.scala:292)
at
org.apache.spark.sql.types.StructType$$anonfun$fieldIndex$1.apply(StructType.scala:292)
at scala.collection.MapLike$class.getOrElse(MapLike.scala:128)
at scala.collection.AbstractMap.getOrElse(Map.scala:59)
at org.apache.spark.sql.types.StructType.fieldIndex(StructType.scala:291)
at
org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema.fieldIndex(rows.scala:186)
... 52 elided
```
I think we should close this.
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