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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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(dataSource: DataSource): StreamingRelation = {
val (name, schema) = dataSource.sourceSchema()
StreamingRelation(dataSource, name, schema.toAttributes)
}
}
/**
* Used to link a streaming [[DataSource]] into a
* [[org.apache.spark.sql.catalyst.plans.logical.LogicalPlan]]. This is only used for creating
* a streaming [[org.apache.spark.sql.DataFrame]] from [[org.apache.spark.sql.DataFrameReader]].
* It should be used to create [[Source]] and converted to [[StreamingExecutionRelation]] when
* passing to [StreamExecution]] to run a query.
*/
case class StreamingRelation(dataSource: DataSource, sourceName: String, output: Seq[Attribute])
extends LeafNode {
override def toString: String = sourceName
}
/**
* Used to link a streaming [[Source]] of data into a
* [[org.apache.spark.sql.catalyst.plans.logical.LogicalPlan]].
*/
case class StreamingExecutionRelation(source: Source, output: Seq[Attribute]) extends LeafNode {
override def toString: String = source.toString
}
object StreamingExecutionRelation {
def apply(source: Source): StreamingExecutionRelation = {
StreamingExecutionRelation(source, source.schema.toAttributes)
}
}
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