| 52 | } |
| 53 | |
| 54 | fn rewrite( |
| 55 | &self, |
| 56 | plan: LogicalPlan, |
| 57 | _config: &dyn OptimizerConfig, |
| 58 | ) -> Result<Transformed<LogicalPlan>> { |
| 59 | match plan { |
| 60 | LogicalPlan::Union(Union { mut inputs, .. }) if inputs.len() == 1 => Ok( |
| 61 | Transformed::yes(Arc::unwrap_or_clone(inputs.pop().unwrap())), |
| 62 | ), |
| 63 | LogicalPlan::Union(Union { inputs, schema }) => { |
| 64 | let inputs = inputs |
| 65 | .into_iter() |
| 66 | .flat_map(extract_plans_from_union) |
| 67 | .map(|plan| Ok(Arc::new(coerce_plan_expr_for_schema(plan, &schema)?))) |
| 68 | .collect::<Result<Vec<_>>>()?; |
| 69 | |
| 70 | Ok(Transformed::yes(LogicalPlan::Union(Union { |
| 71 | inputs, |
| 72 | schema, |
| 73 | }))) |
| 74 | } |
| 75 | LogicalPlan::Distinct(Distinct::All(nested_plan)) => { |
| 76 | match Arc::unwrap_or_clone(nested_plan) { |
| 77 | LogicalPlan::Union(Union { inputs, schema }) => { |
| 78 | let inputs = inputs |
| 79 | .into_iter() |
| 80 | .map(extract_plan_from_distinct) |
| 81 | .flat_map(extract_plans_from_union) |
| 82 | .map(|plan| coerce_plan_expr_for_schema(plan, &schema)) |
| 83 | .collect::<Result<Vec<_>>>()?; |
| 84 | |
| 85 | Ok(Transformed::yes(LogicalPlan::Distinct(Distinct::All( |
| 86 | Arc::new(LogicalPlan::Union(Union { |
| 87 | inputs: inputs.into_iter().map(Arc::new).collect_vec(), |
| 88 | schema: Arc::clone(&schema), |
| 89 | })), |
| 90 | )))) |
| 91 | } |
| 92 | nested_plan => Ok(Transformed::no(LogicalPlan::Distinct( |
| 93 | Distinct::All(Arc::new(nested_plan)), |
| 94 | ))), |
| 95 | } |
| 96 | } |
| 97 | _ => Ok(Transformed::no(plan)), |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | fn extract_plans_from_union(plan: Arc<LogicalPlan>) -> Vec<LogicalPlan> { |