Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19424#discussion_r144209319 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceReaderHolder.scala --- @@ -0,0 +1,64 @@ +/* + * 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.datasources.v2 + +import java.util.Objects + +import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeReference} +import org.apache.spark.sql.sources.v2.reader._ + +/** + * A base class for data source reader holder and defines equals/hashCode methods. + */ +trait DataSourceReaderHolder { + def fullOutput: Seq[AttributeReference] + def reader: DataSourceV2Reader + + override def equals(other: Any): Boolean = other match { + case other: DataSourceV2Relation => + val basicEquals = this.fullOutput == other.fullOutput && + this.reader.getClass == other.reader.getClass && + this.reader.readSchema() == other.reader.readSchema() + + val samePushedFilters = (this.reader, other.reader) match { + case (l: SupportsPushDownCatalystFilters, r: SupportsPushDownCatalystFilters) => + l.pushedCatalystFilters().toSeq == r.pushedCatalystFilters().toSeq + case (l: SupportsPushDownFilters, r: SupportsPushDownFilters) => + l.pushedFilters().toSeq == r.pushedFilters().toSeq --- End diff -- good catch!
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