(
&self,
plan: LogicalPlan,
_config: &dyn OptimizerConfig,
)
| 53 | } |
| 54 | |
| 55 | fn rewrite( |
| 56 | &self, |
| 57 | plan: LogicalPlan, |
| 58 | _config: &dyn OptimizerConfig, |
| 59 | ) -> Result<Transformed<LogicalPlan>> { |
| 60 | match plan { |
| 61 | LogicalPlan::EmptyRelation(_) => Ok(Transformed::no(plan)), |
| 62 | LogicalPlan::Projection(_) |
| 63 | | LogicalPlan::Filter(_) |
| 64 | | LogicalPlan::Window(_) |
| 65 | | LogicalPlan::Sort(_) |
| 66 | | LogicalPlan::SubqueryAlias(_) |
| 67 | | LogicalPlan::Repartition(_) |
| 68 | | LogicalPlan::Limit(_) => { |
| 69 | let empty = empty_child(&plan)?; |
| 70 | if let Some(empty_plan) = empty { |
| 71 | return Ok(Transformed::yes(empty_plan)); |
| 72 | } |
| 73 | Ok(Transformed::no(plan)) |
| 74 | } |
| 75 | LogicalPlan::Join(ref join) => { |
| 76 | let (left_empty, right_empty) = binary_plan_children_is_empty(&plan)?; |
| 77 | let left_field_count = join.left.schema().fields().len(); |
| 78 | |
| 79 | match join.join_type { |
| 80 | // For Full Join, only both sides are empty, the Join result is empty. |
| 81 | JoinType::Full if left_empty && right_empty => Ok(Transformed::yes( |
| 82 | LogicalPlan::EmptyRelation(EmptyRelation { |
| 83 | produce_one_row: false, |
| 84 | schema: Arc::clone(&join.schema), |
| 85 | }), |
| 86 | )), |
| 87 | // For Full Join, if one side is empty, replace with a |
| 88 | // Projection that null-pads the empty side's columns. |
| 89 | JoinType::Full if right_empty => { |
| 90 | Ok(Transformed::yes(build_null_padded_projection( |
| 91 | Arc::clone(&join.left), |
| 92 | &join.schema, |
| 93 | left_field_count, |
| 94 | true, |
| 95 | )?)) |
| 96 | } |
| 97 | JoinType::Full if left_empty => { |
| 98 | Ok(Transformed::yes(build_null_padded_projection( |
| 99 | Arc::clone(&join.right), |
| 100 | &join.schema, |
| 101 | left_field_count, |
| 102 | false, |
| 103 | )?)) |
| 104 | } |
| 105 | JoinType::Inner if left_empty || right_empty => Ok(Transformed::yes( |
| 106 | LogicalPlan::EmptyRelation(EmptyRelation { |
| 107 | produce_one_row: false, |
| 108 | schema: Arc::clone(&join.schema), |
| 109 | }), |
| 110 | )), |
| 111 | JoinType::Left if left_empty => Ok(Transformed::yes( |
| 112 | LogicalPlan::EmptyRelation(EmptyRelation { |
nothing calls this directly
no test coverage detected