Metadata of inner queries only accessible via '*' to outer queries

[TariqAHassan]

OrientDB Version: 3.0.7

Java Version: java 10.0.2

OS: macOS 10.13.6

Expected behavior

Take the following for example:

select * from (select @rid from CLASS)

this recovers a 'list' of @rids which, intuitively at least, should match:

select @rid from (select @rid from CLASS)

Actual behavior

The first result, as stated above, is a list of @rids whereas the second is NULL.

Steps to reproduce

Run the queries above.

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Perhaps I've missed it, but could not find an account of this behavior in the docs.
If such an account exists, it would be nice to be pointed to it. (I am aware of this).

I personally find this behaviour to be quite counterintuitive. Moreover, it is quite problematic
for the Python driver which relies somewhat heavily @rids to construct its representation
of vertices and edges.

Thanks!