Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/16578#discussion_r148446396 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/JoinFieldExtractionPushdown.scala --- @@ -0,0 +1,66 @@ +/* + * 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.optimizer + +import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeSet, NamedExpression} +import org.apache.spark.sql.catalyst.planning.PhysicalOperation +import org.apache.spark.sql.catalyst.plans.logical.{Join, LogicalPlan, Project} + +/** + * Pushes down aliases to [[expressions.GetStructField]] expressions in a projection over a join + * and its join condition. The original [[expressions.GetStructField]] expressions are replaced + * with references to the pushed down aliases. + */ +object JoinFieldExtractionPushdown extends FieldExtractionPushdown { --- End diff -- Oh, I just meant we may skip most of the rule if it can't be applied. Please see my comment below.
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