@Nullable
  @Override
  public <R, C> R accept(ExpressionBiVisitor<R, C> visitor, @Nullable C context) {
    return visitor.visit(this, context);
  }
Returns current path in java bean format: {@code foo.bar.qux}. For root path returns
empty list ({@code ""}).
criteria/common/src/org/immutables/criteria/expression/Path.java