forked from apache/arrow
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
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]>
- Loading branch information
1 parent
31e3e39
commit bac735b
Showing
3 changed files
with
276 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
90 changes: 90 additions & 0 deletions
90
java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/binder/MapBinder.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| * 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.arrow.adapter.jdbc.binder; | ||
|
|
||
| import java.sql.PreparedStatement; | ||
| import java.sql.SQLException; | ||
| import java.sql.Types; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
|
|
||
| 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; | ||
|
|
||
| /** | ||
| * A column binder for map of primitive values. | ||
| */ | ||
| public class MapBinder extends BaseColumnBinder<MapVector> { | ||
|
|
||
| private UnionMapReader reader; | ||
| private final boolean isTextKey; | ||
| private final boolean isTextValue; | ||
|
|
||
| public MapBinder(MapVector vector) { | ||
| this(vector, Types.VARCHAR); | ||
| } | ||
|
|
||
| /** | ||
| * 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); | ||
| } | ||
|
|
||
| @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); | ||
| } | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters