Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18865#discussion_r136688344
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JsonFileFormat.scala
---
@@ -114,6 +114,21 @@ class JsonFileFormat extends TextBasedFileFormat with
DataSourceRegister {
}
(file: PartitionedFile) => {
+ // SPARK-21610: when the `requiredSchema` only contains
`_corrupt_record`,
+ // the derived `actualSchema` is empty and the `_corrupt_record` are
all null for all rows.
+ // When users requires only `_corrupt_record`, we assume that the
corrupt records are required
+ // for all json fields, i.g., all items in dataSchema.
--- End diff --
This comment is wrong now. We can get rid of this comment as the following
exception is self-explained.
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