org.apache.flink.table.runtime.arrow.ArrowReader 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
* limitations under the License.
*/
package org.apache.flink.table.runtime.arrow;
import org.apache.flink.annotation.Internal;
import org.apache.flink.table.data.RowData;
import org.apache.flink.table.data.columnar.ColumnarRowData;
import org.apache.flink.table.data.columnar.vector.ColumnVector;
import org.apache.flink.table.data.columnar.vector.VectorizedColumnBatch;
import org.apache.flink.util.Preconditions;
/** {@link ArrowReader} which read the underlying Arrow format data as {@link RowData}. */
@Internal
public final class ArrowReader {
/**
* An array of vectors which are responsible for the deserialization of each column of the rows.
*/
private final ColumnVector[] columnVectors;
/** Reusable row used to hold the deserialized result. */
private final ColumnarRowData reuseRow;
public ArrowReader(ColumnVector[] columnVectors) {
this.columnVectors = Preconditions.checkNotNull(columnVectors);
this.reuseRow = new ColumnarRowData();
reuseRow.setVectorizedColumnBatch(new VectorizedColumnBatch(columnVectors));
}
/** Gets the column vectors. */
public ColumnVector[] getColumnVectors() {
return columnVectors;
}
/** Read the specified row from underlying Arrow format data. */
public RowData read(int rowId) {
reuseRow.setRowId(rowId);
return reuseRow;
}
}