org.apache.comet.parquet.RowIndexColumnReader 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, 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.comet.parquet;
import org.apache.spark.sql.types.*;
/**
* A column reader that returns the row index vector. Used for reading row index metadata column for
* Spark 3.4+. The row index can be accessed by {@code _tmp_metadata_row_index} column.
*/
public class RowIndexColumnReader extends MetadataColumnReader {
/** The row indices that are used to initialize this column reader. */
private final long[] indices;
/** The current number of indices to skip reading from {@code indices}. */
private long offset;
public RowIndexColumnReader(StructField field, int batchSize, long[] indices) {
super(field.dataType(), TypeUtil.convertToParquet(field), false);
this.indices = indices;
setBatchSize(batchSize);
}
@Override
public void readBatch(int total) {
Native.resetBatch(nativeHandle);
int count = Native.setIndices(nativeHandle, offset, total, indices);
offset += count;
super.readBatch(count);
}
}