fabiencelier opened a new issue #9636:
URL: https://github.com/apache/arrow/issues/9636
Hello,
I am receiving a `ListVector` wrapping a `Float8Vector` and I'd like to
deserialize them into Java `double[]` (each array has 1000 elements).
At the moment I do the following:
```java
public static List<double[]> deserialize(ListVector listVector) {
final Float8Vector underlying = (Float8Vector) listVector.getDataVector();
final List<double[]> deserialized = new ArrayList<>();
for (int index = 0; index < listVector.getValueCount(); index++) {
final int first = listVector.getElementStartIndex(index);
final int last = listVector.getElementEndIndex(index);
final int size = last - first;
double[] data = new double[size];
for (int i = 0; i < size; i++) {
data[i] = underlying.get(first + i);
}
}
return deserialized;
}
```
But it feels inefficient to retrieve the values one by one, is there a way
to get all the values between `first` and `last` directly into a `double[]`
with one call ?
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