Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18865#discussion_r136714700
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JsonFileFormat.scala
---
@@ -113,6 +113,18 @@ class JsonFileFormat extends TextBasedFileFormat with
DataSourceRegister {
}
}
+ if (requiredSchema.length == 1 &&
+ requiredSchema.head.name == parsedOptions.columnNameOfCorruptRecord)
{
+ throw new AnalysisException(
+ s"""
+ |'${parsedOptions.columnNameOfCorruptRecord}' cannot be
selected alone without other
+ |data columns. If you want to select corrupt records only,
cache or save the Dataset
+ |before executing queries. For example:
--- End diff --
I would explain the downside of this in short, for example, `... as this
parses all data under the hood ...`.
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