spark SupportsPushDownV2Filters 源码
spark SupportsPushDownV2Filters 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsPushDownV2Filters.java
/*
* 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.connector.read;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.expressions.filter.Predicate;
/**
* A mix-in interface for {@link ScanBuilder}. Data sources can implement this interface to
* push down V2 {@link Predicate} to the data source and reduce the size of the data to be read.
* Please Note that this interface is preferred over {@link SupportsPushDownFilters}, which uses
* V1 {@link org.apache.spark.sql.sources.Filter} and is less efficient due to the
* internal -> external data conversion.
*
* @since 3.3.0
*/
@Evolving
public interface SupportsPushDownV2Filters extends ScanBuilder {
/**
* Pushes down predicates, and returns predicates that need to be evaluated after scanning.
* <p>
* Rows should be returned from the data source if and only if all of the predicates match.
* That is, predicates must be interpreted as ANDed together.
*/
Predicate[] pushPredicates(Predicate[] predicates);
/**
* Returns the predicates that are pushed to the data source via
* {@link #pushPredicates(Predicate[])}.
* <p>
* There are 3 kinds of predicates:
* <ol>
* <li>pushable predicates which don't need to be evaluated again after scanning.</li>
* <li>pushable predicates which still need to be evaluated after scanning, e.g. parquet row
* group predicate.</li>
* <li>non-pushable predicates.</li>
* </ol>
* <p>
* Both case 1 and 2 should be considered as pushed predicates and should be returned
* by this method.
* <p>
* It's possible that there is no predicates in the query and
* {@link #pushPredicates(Predicate[])} is never called,
* empty array should be returned for this case.
*/
Predicate[] pushedPredicates();
}
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