spark StreamingRelationV2 源码

2022-10-20
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spark StreamingRelationV2 代码

文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/streaming/StreamingRelationV2.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.catalyst.streaming

import org.apache.spark.sql.catalyst.analysis.MultiInstanceRelation
import org.apache.spark.sql.catalyst.expressions.Attribute
import org.apache.spark.sql.catalyst.plans.logical.{LeafNode, LogicalPlan, Statistics}
import org.apache.spark.sql.connector.catalog.{CatalogPlugin, Identifier, Table, TableProvider}
import org.apache.spark.sql.util.CaseInsensitiveStringMap

// We have to pack in the V1 data source as a shim, for the case when a source implements
// continuous processing (which is always V2) but only has V1 microbatch support. We don't
// know at read time whether the query is continuous or not, so we need to be able to
// swap a V1 relation back in.
/**
 * Used to link a [[Table]] into a streaming [[LogicalPlan]].
 */
case class StreamingRelationV2(
    source: Option[TableProvider],
    sourceName: String,
    table: Table,
    extraOptions: CaseInsensitiveStringMap,
    output: Seq[Attribute],
    catalog: Option[CatalogPlugin],
    identifier: Option[Identifier],
    v1Relation: Option[LogicalPlan])
  extends LeafNode with MultiInstanceRelation {
  override lazy val resolved = v1Relation.forall(_.resolved)
  override def isStreaming: Boolean = true
  override def toString: String = sourceName

  override def computeStats(): Statistics = Statistics(
    sizeInBytes = BigInt(conf.defaultSizeInBytes)
  )

  override def newInstance(): LogicalPlan = this.copy(output = output.map(_.newInstance()))
}

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