Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/12247#discussion_r59297156
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala ---
@@ -129,8 +129,17 @@ trait SchemaRelationProvider {
* Implemented by objects that can produce a streaming [[Source]] for a
specific format or system.
*/
trait StreamSourceProvider {
+
+ /** Returns the name and schema of the source that can be used to
continually read data. */
+ def sourceSchema(
+ sqlContext: SQLContext,
+ schema: Option[StructType],
+ providerName: String,
+ parameters: Map[String, String]): (String, StructType)
+
def createSource(
sqlContext: SQLContext,
+ sourceId: Long,
--- End diff --
I thought the goal was to have all the data in the same location. With
this API everyone needs to duplicate the checkpoint location resolution logic.
Note that if you want a unique identifier the path also qualifies.
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