Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/11572#discussion_r55340181
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -34,14 +34,39 @@ import org.apache.spark.sql.sources._
import org.apache.spark.sql.types.{CalendarIntervalType, StructType}
import org.apache.spark.util.Utils
-case class ResolvedDataSource(provider: Class[_], relation: BaseRelation)
-
/**
- * Responsible for taking a description of a datasource (either from
- * [[org.apache.spark.sql.DataFrameReader]], or a metastore) and
converting it into a logical
- * relation that can be used in a query plan.
+ * The main class responsible for representing a pluggable Data Source in
Spark SQL. In addition to
+ * acting as the canonical set of parameters that can describe a Data
Source, this class is used to
+ * resolve a description to a concrete implementation that can be used in
a query plan
+ * (either batch or streaming) or to write out out data using an external
library.
--- End diff --
nit: `write out ...`
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