andywebb1975 commented on PR #3676:
URL: https://github.com/apache/solr/pull/3676#issuecomment-3316243205
The stream expression below exercises `fullOuterJoin` to implement RRF
across two result sets (the two `sort/list/tuple` blocks would be `search`es in
real world examples):
```
top(
n=10,
sort(
select(
fullOuterJoin(
sort(
select(
sort(
list(
tuple(id=1, title="L 1", left="a",
score=4.5),
tuple(id=2, title="L 2", left="b",
score=3.5),
tuple(id=3, title="L 3", left="c",
score=2.5),
tuple(id=4, title="L 4", left="d",
score=2.5),
tuple(id=5, title="L 5", left="e",
score=2.5),
tuple(id=6, title="L 6", left="f",
score=2.5),
),
by="score desc"
),
*,
score as scoreL,
add(recNum(),1) as rankL,
div(1,add(rankL,60)) as rrL
),
by="id asc"
),
sort(
select(
sort(
list(
tuple(id=3, title="R 3", right="g",
score=0.9),
tuple(id=2, title="R 2", right="h",
score=0.8),
tuple(id=4, title="R 4", right="i",
score=0.7),
tuple(id=7, title="R 7", right="j",
score=0.6),
tuple(id=8, title="R 8", right="k",
score=0.5),
tuple(id=9, title="R 9", right="l",
score=0.5),
),
by="score desc"
),
*,
score as scoreR,
add(recNum(),1) as rankR,
div(1,add(rankR,60)) as rrR
),
by="id asc"
),
on="id"
),
*,
replace(rrL,null,withValue=0),
replace(rrR,null,withValue=0),
add(rrL,rrR) as rrf,
),
by="rrf desc"
),
sort="rrf desc"
)
```
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