cloud-fan commented on a change in pull request #24356: [SPARK-27448][SQL] File
source V2 table provider should be compatible with V1 provider
URL: https://github.com/apache/spark/pull/24356#discussion_r275326254
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/rules.scala
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@@ -235,6 +236,24 @@ case class PreprocessTableCreation(sparkSession:
SparkSession) extends Rule[Logi
}
}
+ private def compatibleProviders(a: Class[_], b: Class[_]): Boolean = {
Review comment:
how about
```
def fallBackToV1(cls: Class[_]) = cls.newInstance match {
case f: FileDataSourceV2 => f.fallbackFileFormat
case _ => cls
}
...
fallBackToV1(existingProvider) == fallBackToV1(specifiedProvider)
```
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