spark RelationTimeTravel 源码
spark RelationTimeTravel 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/RelationTimeTravel.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.analysis
import org.apache.spark.sql.catalyst.expressions.{Attribute, Expression}
import org.apache.spark.sql.catalyst.plans.logical.{LeafNode, LogicalPlan}
import org.apache.spark.sql.catalyst.trees.TreePattern.{RELATION_TIME_TRAVEL, TreePattern}
/**
* A logical node used to time travel the child relation to the given `timestamp` or `version`.
* The `child` must support time travel, e.g. a v2 source, and cannot be a view, subquery or stream.
* The timestamp expression cannot refer to any columns.
*/
case class RelationTimeTravel(
relation: LogicalPlan,
timestamp: Option[Expression],
version: Option[String]) extends LeafNode {
override def output: Seq[Attribute] = Nil
override lazy val resolved: Boolean = false
override val nodePatterns: Seq[TreePattern] = Seq(RELATION_TIME_TRAVEL)
}
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