slinkydeveloper commented on a change in pull request #17768: URL: https://github.com/apache/flink/pull/17768#discussion_r749331269
########## File path: flink-table/flink-table-common/src/main/java/org/apache/flink/table/data/utils/ProjectedRowData.java ########## @@ -0,0 +1,212 @@ +/* + * 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.flink.table.data.utils; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.table.data.ArrayData; +import org.apache.flink.table.data.DecimalData; +import org.apache.flink.table.data.MapData; +import org.apache.flink.table.data.RawValueData; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.data.StringData; +import org.apache.flink.table.data.TimestampData; +import org.apache.flink.table.types.DataType; +import org.apache.flink.types.RowKind; + +import java.util.Arrays; +import java.util.Objects; + +/** + * An implementation of {@link RowData} which provides a projected view of the underlying {@link + * RowData}. + */ +@PublicEvolving +public class ProjectedRowData implements RowData { + + private final int[] indexMapping; + + private RowData row; + + private ProjectedRowData(int[] indexMapping) { + this.indexMapping = indexMapping; + } + + /** + * Replaces the underlying {@link RowData} backing this {@link ProjectedRowData}. + * + * <p>This method replaces the row data in place and does not return a new object. This is done + * for performance reasons. + */ + public ProjectedRowData replaceRow(RowData row) { + this.row = row; + return this; + } + + // --------------------------------------------------------------------------------------------- + + @Override + public int getArity() { + return indexMapping.length; + } + + @Override + public RowKind getRowKind() { + return row.getRowKind(); + } + + @Override + public void setRowKind(RowKind kind) { + row.setRowKind(kind); + } + + @Override + public boolean isNullAt(int pos) { + return row.isNullAt(indexMapping[pos]); + } + + @Override + public boolean getBoolean(int pos) { + return row.getBoolean(indexMapping[pos]); + } + + @Override + public byte getByte(int pos) { + return row.getByte(indexMapping[pos]); + } + + @Override + public short getShort(int pos) { + return row.getShort(indexMapping[pos]); + } + + @Override + public int getInt(int pos) { + return row.getInt(indexMapping[pos]); + } + + @Override + public long getLong(int pos) { + return row.getLong(indexMapping[pos]); + } + + @Override + public float getFloat(int pos) { + return row.getFloat(indexMapping[pos]); + } + + @Override + public double getDouble(int pos) { + return row.getDouble(indexMapping[pos]); + } + + @Override + public StringData getString(int pos) { + return row.getString(indexMapping[pos]); + } + + @Override + public DecimalData getDecimal(int pos, int precision, int scale) { + return row.getDecimal(indexMapping[pos], precision, scale); + } + + @Override + public TimestampData getTimestamp(int pos, int precision) { + return row.getTimestamp(indexMapping[pos], precision); + } + + @Override + public <T> RawValueData<T> getRawValue(int pos) { + return row.getRawValue(indexMapping[pos]); + } + + @Override + public byte[] getBinary(int pos) { + return row.getBinary(indexMapping[pos]); + } + + @Override + public ArrayData getArray(int pos) { + return row.getArray(indexMapping[pos]); + } + + @Override + public MapData getMap(int pos) { + return row.getMap(indexMapping[pos]); + } + + @Override + public RowData getRow(int pos, int numFields) { + return row.getRow(indexMapping[pos], numFields); + } + + @Override + public boolean equals(Object o) { + if (this == o) { + return true; + } + if (o == null || getClass() != o.getClass()) { + return false; + } + ProjectedRowData that = (ProjectedRowData) o; + return Arrays.equals(indexMapping, that.indexMapping) && Objects.equals(row, that.row); + } + + @Override + public int hashCode() { + return Objects.hash(Arrays.hashCode(indexMapping), row); + } + + @Override + public String toString() { + return row.getRowKind().shortString() + + "{" + + "indexMapping=" + + Arrays.toString(indexMapping) + + ", mutableRow=" + + row + + '}'; + } + + /** + * Like {@link #from(int[])}, but throws {@link IllegalArgumentException} if the provided {@code + * projection} array contains nested projections, which are not supported by {@link + * ProjectedRowData}. + */ + public static ProjectedRowData from(int[][] projection) { Review comment: Explained and linked to `Projection` type -- This is an automated message from the Apache Git Service. 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