davisusanibar commented on issue #39787:
URL: https://github.com/apache/arrow/issues/39787#issuecomment-1910881503
@gszadovszky Would it be possible to use MapVector instead?
````
import org.apache.arrow.memory.RootAllocator;
import org.apache.arrow.vector.complex.MapVector;
import org.apache.arrow.vector.complex.impl.UnionMapWriter;
public class TestMeMapVector {
public static void main(String[] args) {
try (MapVector mapVector = MapVector.empty("map", new
RootAllocator(), false)) {
mapVector.allocateNew();
UnionMapWriter mapWriter = mapVector.getWriter();
mapWriter.allocate();
mapWriter.startMap();
mapWriter.startEntry();
mapWriter.key().varChar().writeVarChar("one");
mapWriter.value().integer().writeInt(1);
mapWriter.endEntry();
mapWriter.startEntry();
mapWriter.key().varChar().writeVarChar("two");
mapWriter.value().integer().writeInt(2);
mapWriter.endEntry();
mapWriter.startEntry();
mapWriter.key().varChar().writeVarChar("three");
mapWriter.value().integer().writeInt(3);
mapWriter.endEntry();
mapWriter.writeNull();
mapWriter.startEntry();
mapWriter.key().varChar().writeVarChar("four");
mapWriter.value().integer().writeNull();
mapWriter.endEntry();
mapWriter.startEntry();
mapWriter.key().varChar().writeVarChar("five");
mapWriter.value().integer().writeInt(5);
mapWriter.endEntry();
mapWriter.endMap();
mapWriter.setValueCount(1);
System.out.println(mapVector);
//
[[{"key":"one","value":1},{"key":"two","value":2},{"key":"three","value":3},null,{"key":"four"},{"key":"five","value":5}]]
}
}
}
````
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