Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/12049#discussion_r58488129 --- 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. Added a `sourceName` field and used it directly
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