Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18865#discussion_r131895717
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JsonFileFormat.scala
---
@@ -114,7 +114,16 @@ class JsonFileFormat extends TextBasedFileFormat with
DataSourceRegister {
}
(file: PartitionedFile) => {
- val parser = new JacksonParser(actualSchema, parsedOptions)
+ // SPARK-21610: when the `requiredSchema` only contains
`_corrupt_record`,
--- End diff --
Yeah, we've also considered this possibility. But currently we thought a
query like `dfFromFile.select($"_corrupt_record")` shows all nulls looks
countering intuition because the query is intended to get the corrupt records
among the JSON records. That is why we provide a fix like current one. IMO,
it's meaningless to have all nulls for `_corrupted_record`.
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