Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18865#discussion_r136714509
--- 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"""
+ |'${parsedOptions.columnNameOfCorruptRecord}' cannot be
selected alone without other
+ |data columns. If you want to select corrupt records only,
cache or save the Dataset
+ |before executing queries. For example:
+ |df.cache() then
+ |df.select("${parsedOptions.columnNameOfCorruptRecord}")
+ """.stripMargin.replaceAll(System.lineSeparator(), " "))
--- End diff --
I wouldn't replace it but just concatenate the strings with `+`, or just
keep the newlines. IIRC, I think using `System.lineSeparator()` wouldn't work
on Windows anyway because the actual newlines of this string in the codes are
`\n` but `System.lineSeparator()` gives `\r\n` up to me knowledge.
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