VisitorMut add Expr

[Promaethius]

My intuition tells me that the VisitorMut walker should be able to add expressions to WHERE or init the selection Option to Some Expr in Statement::Query body::Select. Is there a quick example of this or is the VisitorMut capable of only traversing the AST nodes if they exist?

[LucaCappelletti94]

VisitorMut::pre_visit_select receives &mut Select, so a visitor can assign select.selection = Some(expr) or combine the existing filter with BinaryOperator::And. On current main, this turns SELECT a FROM t into SELECT a FROM t WHERE tenant_id = 42. Closing as answered.