Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18865
A use case might be:
```
echo '{"field": 1
{"field" 2}
{"field": 3}' >/tmp/sample.json
```
```scala
val file = "/tmp/sample.json"
val dfFromFile = spark.read.schema("field BYTE, _corrupt_record
STRING").json(file)
dfFromFile.show(false)
dfFromFile.filter($"_corrupt_record".isNotNull).count()
dfFromFile.filter($"_corrupt_record".isNull).count()
dfFromFile.select($"_corrupt_record").show()
```
```
scala> dfFromFile.show(false)
+-----+---------------+
|field|_corrupt_record|
+-----+---------------+
|null |{"field": 1 |
|null | {"field" 2} |
|3 |null |
+-----+---------------+
scala> dfFromFile.filter($"_corrupt_record".isNotNull).count()
res1: Long = 2
scala> dfFromFile.filter($"_corrupt_record".isNull).count()
res2: Long = 1
scala> dfFromFile.select($"_corrupt_record").show()
+---------------+
|_corrupt_record|
+---------------+
| {"field": 1|
| {"field" 2}|
| null|
+---------------+
```
I was thinking of avoiding to blacklist a case which works before without
an exception but it looks we (at least I) are less sure if it is a bug.
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