[Java] MapVector written data does not meet expectations

[hawk9821]

What would you like help with?

    RootAllocator allocator = new RootAllocator(Long.MAX_VALUE);
    Map<String, String> metadata = new HashMap<>();
    metadata.put("K1", "V1");
    metadata.put("K2", "V2");
    Field a = new Field("key", FieldType.notNullable(new ArrowType.Int(32, true)), null);
    Field b = new Field("value", FieldType.nullable(new ArrowType.Int(32,true)), null);
    Schema schema = new Schema(asList(a, b), metadata);
    Field struct = new Field("struct", FieldType.notNullable(new ArrowType.Struct()), schema.getFields());
    StructVector structVector = new StructVector(Field.nullable("struct", struct.getType()), allocator, null);
    MapVector mapVector = new MapVector(Field.nullable("map", structVector.getField().getType()), allocator, null);
    mapVector.initializeChildrenFromFields(Collections.singletonList(struct));
    mapVector.allocateNew();
    
    UnionMapWriter writer = mapVector.getWriter();
    for (int i = 0; i < 10; i++) {
        writer.startMap();
        writer.setPosition(i);
        writer.key().writeInt(i);
        writer.value().writeInt(i * 10);
        writer.endMap();
    }
    writer.setValueCount(10);

when the types of key and value are different, data cannot be written .
Only examples of ListVector are available in the documentation on the official website ,Please provide an example of writing data to MapVector.

[lidavidm]

I think this belongs on apache/arrow and not apache/arrow-adbc?

[hawk9821]

I think this belongs on apache/arrow and not apache/arrow-adbc?

yes , here are the dependencies , version is 15.0.1

        <dependency>
            <groupId>org.apache.arrow</groupId>
            <artifactId>arrow-vector</artifactId>
            <version>${arrow.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.arrow</groupId>
            <artifactId>arrow-memory-netty</artifactId>
            <version>${arrow.version}</version>
        </dependency>

[hawk9821]

@lidavidm hi, whether the community has a plan to provide the correct MapVector example

[lidavidm]

@hawk9821 sorry for the delay, if I can find some time I will try to add a Cookbook example