Function mz_transform::semijoin_idempotence::as_filtered_get

fn as_filtered_get(
    expr: &MirRelationExpr,
    gets_behind_gets: &BTreeMap<LocalId, Vec<(Id, Vec<MirScalarExpr>)>>
) -> Vec<(Id, Vec<MirScalarExpr>)>

Attempts to interpret expr as filters applied to a Get.

Returns a list of such interpretations, potentially spanning Let bindings.