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ARROW-17629: [Java] Bind DB column to Arrow Map type in JdbcToArrowUt…
…ils (apache#14134) This pull request allows support of mapping for map type (hstore translated by jdbc driver to java.util.Map or json text/varchar). Mapping for MapConsumer should be manually expressed in new JdbcToArrowConfigBuilder(...).setJdbcToArrowTypeConverter(USER_CUSTOM_jdbcToArrowTypeConverter). Now it possible as part of [ARROW-17630](https://issues.apache.org/jira/browse/ARROW-17630) that allow user to distinguish columns by number and related external metadata. Authored-by: igor.suhorukov <igor.suhorukov@gmail.com> Signed-off-by: David Li <li.davidm96@gmail.com>
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104
java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/MapConsumer.java
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| @@ -0,0 +1,104 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.arrow.adapter.jdbc.consumer; | ||
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| import java.io.IOException; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.sql.ResultSet; | ||
| import java.sql.SQLException; | ||
| import java.util.Map; | ||
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| import org.apache.arrow.memory.ArrowBuf; | ||
| import org.apache.arrow.memory.BufferAllocator; | ||
| import org.apache.arrow.vector.complex.MapVector; | ||
| import org.apache.arrow.vector.complex.impl.UnionMapWriter; | ||
| import org.apache.arrow.vector.util.ObjectMapperFactory; | ||
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| import com.fasterxml.jackson.core.type.TypeReference; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
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| /** | ||
| * Consumer which consume map type values from {@link ResultSet}. | ||
| * Write the data into {@link org.apache.arrow.vector.complex.MapVector}. | ||
| */ | ||
| public class MapConsumer extends BaseConsumer<MapVector> { | ||
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| private final UnionMapWriter writer; | ||
| private final ObjectMapper objectMapper = ObjectMapperFactory.newObjectMapper(); | ||
| private final TypeReference<Map<String, String>> typeReference = new TypeReference<Map<String, String>>() {}; | ||
| private int currentRow; | ||
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| /** | ||
| * Creates a consumer for {@link MapVector}. | ||
| */ | ||
| public static MapConsumer createConsumer(MapVector mapVector, int index, boolean nullable) { | ||
| return new MapConsumer(mapVector, index); | ||
| } | ||
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| /** | ||
| * Instantiate a MapConsumer. | ||
| */ | ||
| public MapConsumer(MapVector vector, int index) { | ||
| super(vector, index); | ||
| writer = vector.getWriter(); | ||
| } | ||
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| @Override | ||
| public void consume(ResultSet resultSet) throws SQLException, IOException { | ||
| Object map = resultSet.getObject(columnIndexInResultSet); | ||
| writer.setPosition(currentRow++); | ||
| if (map != null) { | ||
| if (map instanceof String) { | ||
| writeJavaMapIntoVector(objectMapper.readValue((String) map, typeReference)); | ||
| } else if (map instanceof Map) { | ||
| writeJavaMapIntoVector((Map<String, String>) map); | ||
| } else { | ||
| throw new IllegalArgumentException("Unknown type of map type column from JDBC " + map.getClass().getName()); | ||
| } | ||
| } else { | ||
| writer.writeNull(); | ||
| } | ||
| } | ||
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| private void writeJavaMapIntoVector(Map<String, String> map) { | ||
| BufferAllocator allocator = vector.getAllocator(); | ||
| writer.startMap(); | ||
| map.forEach((key, value) -> { | ||
| byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8); | ||
| byte[] valueBytes = value != null ? value.getBytes(StandardCharsets.UTF_8) : null; | ||
| try ( | ||
| ArrowBuf keyBuf = allocator.buffer(keyBytes.length); | ||
| ArrowBuf valueBuf = valueBytes != null ? allocator.buffer(valueBytes.length) : null; | ||
| ) { | ||
| writer.startEntry(); | ||
| keyBuf.writeBytes(keyBytes); | ||
| writer.key().varChar().writeVarChar(0, keyBytes.length, keyBuf); | ||
| if (valueBytes != null) { | ||
| valueBuf.writeBytes(valueBytes); | ||
| writer.value().varChar().writeVarChar(0, valueBytes.length, valueBuf); | ||
| } else { | ||
| writer.value().varChar().writeNull(); | ||
| } | ||
| writer.endEntry(); | ||
| } | ||
| }); | ||
| writer.endMap(); | ||
| } | ||
| } | ||
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