hawk9821 opened a new issue, #44664:
URL: https://github.com/apache/arrow/issues/44664
### 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 .
Please provide an example of writing data to MapVector
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