GeezerVison

FindSharedIndexes looks for sibling MapIndex operators with
graph.getSuccessors(input.node()). The graph records edges per operator, not
per output port, so for a multi-output producer (such as the nested operator
of two mutually recursive views) the siblings include indexes over different
outputs. The grouping checked key and value nullability but not the port, so
ReplaceSharedIndexes built a single index from the first port and gave it to
consumers of the other port, which then silently read the wrong stream.

Skip a sibling unless it reads the same OutputPort (operator and port number).
Indexes over the same port are still shared.

The new SharedIndexPortTests joins each of two same-typed mutually recursive
views to a table (cross join and equi-join). Before the fix out_b returns a's
rows; with it both views are correct.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Signed-off-by: bens-secret-alt-account <[email protected]>