@Override
    public boolean doesBitPacking() {
        return getDataType() instanceof TensorDataType tensor &&
               tensor.getTensorType().valueType() == TensorType.Value.INT8 &&
               containsExpression(PackBitsExpression.class);
    }
Returns true if (there is strong evidence that) the value stored by this field is bit-packed.
config-model/src/main/java/com/yahoo/schema/document/SDField.java