org.apache.spark.sql.sources.v2.reader.SupportsScanUnsafeRow Maven / Gradle / Ivy
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* 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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.spark.sql.sources.v2.reader;
import java.util.List;
import org.apache.spark.annotation.InterfaceStability;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.catalyst.expressions.UnsafeRow;
/**
* A mix-in interface for {@link DataSourceReader}. Data source readers can implement this
* interface to output {@link UnsafeRow} directly and avoid the row copy at Spark side.
* This is an experimental and unstable interface, as {@link UnsafeRow} is not public and may get
* changed in the future Spark versions.
*/
@InterfaceStability.Unstable
public interface SupportsScanUnsafeRow extends DataSourceReader {
@Override
default List> createDataReaderFactories() {
throw new IllegalStateException(
"createDataReaderFactories not supported by default within SupportsScanUnsafeRow");
}
/**
* Similar to {@link DataSourceReader#createDataReaderFactories()},
* but returns data in unsafe row format.
*/
List> createUnsafeRowReaderFactories();
}