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ARROW-17431: [Java] MapBinder to bind Arrow Map type to DB column (ap…
…ache#13941) Typical real life Arrow datasets contain map of primitive type. This PR introduce MapBinder mapping of primitive types map entries Authored-by: igor.suhorukov <[email protected]> Signed-off-by: David Li <[email protected]>
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java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/binder/MapBinder.java
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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, | ||
| * 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.binder; | ||
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| import java.sql.PreparedStatement; | ||
| import java.sql.SQLException; | ||
| import java.sql.Types; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
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| import org.apache.arrow.vector.complex.MapVector; | ||
| import org.apache.arrow.vector.complex.impl.UnionMapReader; | ||
| import org.apache.arrow.vector.types.pojo.ArrowType; | ||
| import org.apache.arrow.vector.types.pojo.Field; | ||
| import org.apache.arrow.vector.util.JsonStringHashMap; | ||
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| /** | ||
| * A column binder for map of primitive values. | ||
| */ | ||
| public class MapBinder extends BaseColumnBinder<MapVector> { | ||
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| private UnionMapReader reader; | ||
| private final boolean isTextKey; | ||
| private final boolean isTextValue; | ||
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| public MapBinder(MapVector vector) { | ||
| this(vector, Types.VARCHAR); | ||
| } | ||
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| /** | ||
| * Init MapBinder and determine type of data vector. | ||
| * | ||
| * @param vector corresponding data vector from arrow buffer for binding | ||
| * @param jdbcType parameter jdbc type | ||
| */ | ||
| public MapBinder(MapVector vector, int jdbcType) { | ||
| super(vector, jdbcType); | ||
| reader = vector.getReader(); | ||
| List<Field> structField = Objects.requireNonNull(vector.getField()).getChildren(); | ||
| if (structField.size() != 1) { | ||
| throw new IllegalArgumentException("Expected Struct field metadata inside Map field"); | ||
| } | ||
| List<Field> keyValueFields = Objects.requireNonNull(structField.get(0)).getChildren(); | ||
| if (keyValueFields.size() != 2) { | ||
| throw new IllegalArgumentException("Expected two children fields " + | ||
| "inside nested Struct field in Map"); | ||
| } | ||
| ArrowType keyType = Objects.requireNonNull(keyValueFields.get(0)).getType(); | ||
| ArrowType valueType = Objects.requireNonNull(keyValueFields.get(1)).getType(); | ||
| isTextKey = ArrowType.Utf8.INSTANCE.equals(keyType); | ||
| isTextValue = ArrowType.Utf8.INSTANCE.equals(valueType); | ||
| } | ||
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| @Override | ||
| public void bind(PreparedStatement statement, | ||
| int parameterIndex, int rowIndex) throws SQLException { | ||
| reader.setPosition(rowIndex); | ||
| LinkedHashMap<Object, Object> tags = new JsonStringHashMap<>(); | ||
| while (reader.next()) { | ||
| Object key = reader.key().readObject(); | ||
| Object value = reader.value().readObject(); | ||
| tags.put(isTextKey && key != null ? key.toString() : key, | ||
| isTextValue && value != null ? value.toString() : value); | ||
| } | ||
| switch (jdbcType) { | ||
| case Types.VARCHAR: | ||
| statement.setString(parameterIndex, tags.toString()); | ||
| break; | ||
| case Types.OTHER: | ||
| default: | ||
| statement.setObject(parameterIndex, tags); | ||
| } | ||
| } | ||
| } |
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