openinx commented on a change in pull request #3240: URL: https://github.com/apache/iceberg/pull/3240#discussion_r739985329
########## File path: flink/src/main/java/org/apache/iceberg/flink/data/RowDataProjection.java ########## @@ -0,0 +1,240 @@ +/* + * 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.iceberg.flink.data; + +import java.util.Map; +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.logical.RowType; +import org.apache.flink.types.RowKind; +import org.apache.iceberg.Schema; +import org.apache.iceberg.flink.FlinkSchemaUtil; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.types.Types; + +public class RowDataProjection implements RowData { + /** + * Creates a projecting wrapper for {@link RowData} rows. + * <p> + * This projection does not work with repeated types like lists and maps. + * + * @param schema schema of rows wrapped by this projection + * @param projectedSchema result schema of the projected rows + * @return a wrapper to project rows + */ + public static RowDataProjection create(Schema schema, Schema projectedSchema) { + return RowDataProjection.create(FlinkSchemaUtil.convert(schema), schema.asStruct(), projectedSchema.asStruct()); + } + + /** + * Creates a projecting wrapper for {@link RowData} rows. + * <p> + * This projection does not work with repeated types like lists and maps. + * + * @param rowType flink row type of rows wrapped by this projection + * @param schema schema of rows wrapped by this projection + * @param projectedSchema result schema of the projected rows + * @return a wrapper to project rows + */ + public static RowDataProjection create(RowType rowType, Types.StructType schema, Types.StructType projectedSchema) { + return new RowDataProjection(rowType, schema, projectedSchema); + } + + private final RowData.FieldGetter[] getters; + private RowData rowData; + + private RowDataProjection(RowType rowType, Types.StructType rowStruct, Types.StructType projectType) { + Map<Integer, Integer> fieldIdToPosition = Maps.newHashMap(); + for (int i = 0; i < rowStruct.fields().size(); i++) { + fieldIdToPosition.put(rowStruct.fields().get(i).fieldId(), i); + } + + this.getters = new RowData.FieldGetter[projectType.fields().size()]; + for (int i = 0; i < getters.length; i++) { + Types.NestedField projectField = projectType.fields().get(i); + Types.NestedField rowField = rowStruct.field(projectField.fieldId()); + if (rowField == null) { + throw new IllegalArgumentException(String.format( + "Cannot locate the project field <%s> in the iceberg struct <%s>", projectField, rowStruct)); + } Review comment: Nit: ```java Preconditions.checkNotNull(rowField, "Cannot locate the project field <%s> in the iceberg struct <%s>", projectField, rowStruct); ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
