pvary commented on code in PR #13340: URL: https://github.com/apache/iceberg/pull/13340#discussion_r2156719229
########## flink/v2.0/flink/src/main/java/org/apache/iceberg/flink/sink/dynamic/convert/RowDataConverter.java: ########## @@ -0,0 +1,89 @@ +/* + * 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.sink.dynamic.convert; + +import org.apache.flink.table.data.GenericRowData; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.types.logical.RowType; + +/** + * {@link RowDataConverter} is responsible to change the input {@link RowData} to make it compatible + * with the target schema. This is done when + * + * <ol> + * <li>The input schema has fewer fields than the target schema. + * <li>The table types are wider than the input type. + * <li>The field order differs for source and target schema. + * </ol> + * + * <p>The resolution is as follows: + * + * <ol> + * <li>In the first case, we would add a null values for the missing field (if the field is + * optional). + * <li>In the second case, we would convert the data for the input field to a wider type, e.g. int + * (input type) => long (table type). + * <li>In the third case, we would rearrange the input data to match the target table. + * </ol> + */ +public class RowDataConverter implements DataConverter { + private final RowData.FieldGetter[] fieldGetters; + private final DataConverter[] dataConverters; + + public RowDataConverter(RowType sourceType, RowType targetType) { + this.fieldGetters = new RowData.FieldGetter[targetType.getFields().size()]; + this.dataConverters = new DataConverter[targetType.getFields().size()]; + + for (int i = 0; i < targetType.getFields().size(); i++) { + RowData.FieldGetter fieldGetter; + DataConverter dataConverter; + RowType.RowField targetField = targetType.getFields().get(i); + int sourceFieldIndex = sourceType.getFieldIndex(targetField.getName()); + if (sourceFieldIndex == -1) { + if (targetField.getType().isNullable()) { + fieldGetter = row -> null; + dataConverter = value -> null; + } else { + throw new IllegalArgumentException( + String.format( + "Field %s in target schema %s is non-nullable but does not exist in source schema.", + i + 1, targetType)); + } + } else { + RowType.RowField sourceField = sourceType.getFields().get(sourceFieldIndex); + fieldGetter = RowData.createFieldGetter(sourceField.getType(), sourceFieldIndex); + dataConverter = DataConverter.getNullable(sourceField.getType(), targetField.getType()); + } + + this.fieldGetters[i] = fieldGetter; + this.dataConverters[i] = dataConverter; + } + } + + @Override + public RowData convert(Object object) { + RowData sourceData = (RowData) object; + GenericRowData targetData = new GenericRowData(fieldGetters.length); + for (int i = 0; i < fieldGetters.length; i++) { + Object value = fieldGetters[i].getFieldOrNull(sourceData); + targetData.setField(i, dataConverters[i].convert(value)); + } Review Comment: nit: newline -- 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: issues-unsubscr...@iceberg.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
