Nuttiiya Seekhao

## Details - Implement `null_equals_null` join (producer, consumer, test: `INTERSECT`) - Fix join schema (semi and anti) bug - The original code passes `join` output schema to `to_substrait_rex()`. This results...

Substrait: Add SubqueryAlias support

4

### Is your feature request related to a problem or challenge? If there is a `SubqueryAlias` relation, `datafusion-substrait` will bypass it. This works for the producer, the generated Substrait plans...