spark AvailableNowSourceWrapper 源码
spark AvailableNowSourceWrapper 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/AvailableNowSourceWrapper.scala
/*
* 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.DataFrame
import org.apache.spark.sql.types.StructType
/**
* This class wraps a [[Source]] and makes it supports Trigger.AvailableNow.
*
* See [[AvailableNowDataStreamWrapper]] for more details.
*/
class AvailableNowSourceWrapper(delegate: Source)
extends AvailableNowDataStreamWrapper(delegate) with Source {
override def schema: StructType = delegate.schema
override def getOffset: Option[Offset] = throw new UnsupportedOperationException(
"latestOffset(Offset, ReadLimit) should be called instead of this method")
override def getBatch(start: Option[Offset], end: Offset): DataFrame =
delegate.getBatch(start, end)
}
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