Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/19136#discussion_r138255810 --- Diff: sql/core/src/main/java/org/apache/spark/sql/sources/v2/reader/downward/FilterPushDownSupport.java --- @@ -0,0 +1,32 @@ +/* + * 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.sources.v2.reader.downward; + +import org.apache.spark.sql.sources.Filter; + +/** + * A mix-in interface for `DataSourceV2Reader`. Users can implement this interface to push down + * filters to the data source and reduce the size of the data to be read. + */ +public interface FilterPushDownSupport { + + /** + * Push down filters, returns unsupported filters. --- End diff -- `Pushes down filters, and returns unsupported filters.`
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