korowa commented on issue #11883:
URL: https://github.com/apache/datafusion/issues/11883#issuecomment-2282747848
Just some thoughts: maybe it's better not to expose this flag, but set it
while planning in case of queries like
```
with data as (
select 1 as f
union all
select 2 as f
union all
select null as f
)
select * from data t1
join data t2
on t1.f is not distinct from t2.f; -- it (probably) may also be
cool to support <=> operator here
```
right now it's planned as cross (technically) join with filter, but in fact
this query may be a hash join with null equals null. And specifying join
conditions like this (via `is not distinct` or spaceship operator) potentially
more convenient to control join behaviour (one query statements instead of `set
datafusion.xxx = true` + query statement)
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