Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/12049#discussion_r58478636
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingRelation.scala
---
@@ -19,16 +19,33 @@ package org.apache.spark.sql.execution.streaming
import org.apache.spark.sql.catalyst.expressions.Attribute
import org.apache.spark.sql.catalyst.plans.logical.LeafNode
+import org.apache.spark.sql.execution.datasources.DataSource
object StreamingRelation {
- def apply(source: Source): StreamingRelation =
- StreamingRelation(source, source.schema.toAttributes)
+ def apply(dataSource: DataSource): StreamingRelation = {
+ val source = dataSource.createSource()
+ StreamingRelation(dataSource, source.schema.toAttributes)
+ }
+}
+
+/**
+ * Used to link a streaming [[DataSource]] into a
+ * [[org.apache.spark.sql.catalyst.plans.logical.LogicalPlan]].
+ */
+case class StreamingRelation(dataSource: DataSource, output:
Seq[Attribute]) extends LeafNode {
+ override def toString: String = dataSource.createSource().toString
--- End diff --
This could be expensive right? I'm not sure that we want to do that in a
`toString`.
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