spark LogicalPlanDistinctKeys 源码
spark LogicalPlanDistinctKeys 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlanDistinctKeys.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.plans.logical
import org.apache.spark.sql.catalyst.expressions.ExpressionSet
import org.apache.spark.sql.internal.SQLConf.PROPAGATE_DISTINCT_KEYS_ENABLED
/**
* A trait to add distinct attributes to [[LogicalPlan]]. For example:
* {{{
* SELECT a, b, SUM(c) FROM Tab1 GROUP BY a, b
* // returns a, b
* }}}
*/
trait LogicalPlanDistinctKeys { self: LogicalPlan =>
lazy val distinctKeys: Set[ExpressionSet] = {
if (conf.getConf(PROPAGATE_DISTINCT_KEYS_ENABLED)) DistinctKeyVisitor.visit(self) else Set.empty
}
}
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