Github user sameeragarwal commented on a diff in the pull request:
https://github.com/apache/spark/pull/17916#discussion_r115626517
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -570,10 +570,20 @@ object DataSource {
// there is exactly one registered alias
head.getClass
case sources =>
- // There are multiple registered aliases for the input
- sys.error(s"Multiple sources found for $provider1 " +
- s"(${sources.map(_.getClass.getName).mkString(", ")}), " +
- "please specify the fully qualified class name.")
+ // There are multiple registered aliases for the input. If there
is single datasource
+ // that has "org.apache.spark" package in the prefix, we use it
considering it is an
+ // internal datasource within Spark.
+ val sourceNames = sources.map(_.getClass.getName)
+ val internalSources =
sources.filter(_.getClass.getName.startsWith("org.apache.spark"))
+ if (internalSources.size == 1) {
+ logWarning(s"Multiple sources found for $provider1
(${sourceNames.mkString(", ")}), " +
+ "please specify the fully qualified class name. " +
--- End diff --
nit: this isn't really actionable so we can consider deleting it from here
and say something like "defaulting to the internal ..."
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