Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17758#discussion_r125396465
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -468,7 +489,13 @@ case class DataSource(
throw new AnalysisException("Cannot save interval data type into
external storage.")
}
- providingClass.newInstance() match {
+ val resolvedRelation = providingClass.newInstance() match {
+ case relationToCheck: DataSourceValidator =>
--- End diff --
can we do the check at
https://github.com/apache/spark/pull/17758/files#diff-7a6cb188d2ae31eb3347b5629a679cecR325
?
Basically
```
val r = dataSource.createRelation(sparkSession.sqlContext,
caseInsensitiveOptions)
SchemaUtils.checkSchemaColumnNameDuplication(r.schema)
r
```
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