Function sql::plan::query::plan_using_constraint

fn plan_using_constraint(
    column_names: &[ColumnName], 
    left_qcx: &QueryContext<'_>, 
    left: HirRelationExpr, 
    left_scope: Scope, 
    right_qcx: &QueryContext<'_>, 
    right: HirRelationExpr, 
    right_scope: Scope, 
    kind: JoinKind
) -> Result<(HirRelationExpr, Scope), PlanError>