Function mz_sql::query_model::attribute::relation_type::union_introduces_nulls
source · fn union_introduces_nulls(
box: &BoundRef<'_, QueryBox>,
cref: &ColumnReference
) -> bool
Expand description
A quantifier referenced the given ColumnReference
introduces nulls if:
- the enclosing box is of type
BoxType::Union
(asserted), and - at least one of the input quantifiers for the given position is nullable.