Function mz_sql::query_model::attribute::relation_type::outer_join_introduces_nulls

source · 
fn outer_join_introduces_nulls(
    box: &BoundRef<'_, QueryBox>,
    cref: &ColumnReference
) -> bool
Expand description

A quantifier referenced the given ColumnReference introduces nulls if:

  1. the enclosing box is of type BoxType::OuterJoin (asserted), and
  2. the other quantifier is preserving.