Struct Translate Apply Rule &nbsp; Copy item path

impl TranslateApplyRule

pub fn create(enable_share_plan: bool) -> Box<dyn FallibleRule<Logical>>

fn rewrite( plan: &PlanRef, correlated_indices: Vec<usize>, offset: usize, index_mapping: &mut ColIndexMapping, data_types: &mut HashMap<usize, DataType>, index: &mut usize, ) -> Option<PlanRef>

Rewrite LogicalApply’s left according to correlated_indices.

Assumption: only LogicalJoin, LogicalScan, LogicalProject and LogicalFilter are in the left.

fn rewrite_join( join: &LogicalJoin, required_col_idx: Vec<usize>, offset: usize, index_mapping: &mut ColIndexMapping, data_types: &mut HashMap<usize, DataType>, index: &mut usize, ) -> Option<PlanRef>

fn rewrite_apply( apply: &LogicalApply, required_col_idx: Vec<usize>, offset: usize, index_mapping: &mut ColIndexMapping, data_types: &mut HashMap<usize, DataType>, index: &mut usize, ) -> Option<PlanRef>

            LogicalApply
           /            \
    LogicalApply       RHS1
   /            \
 LHS           RHS2

A common structure of multi scalar subqueries is a chain of LogicalApply. To avoid exponential growth of the domain operator, we need to rewrite the apply and try to simplify the domain as much as possible. We use a top-down apply order to rewrite the apply, so that we don’t need to handle operator like project and aggregation generated by the domain calculation. As a cost, we need to add a flag translated to the apply operator to remind translate_apply_rule that the apply has been translated.

fn rewrite_scan( scan: &LogicalScan, required_col_idx: Vec<usize>, offset: usize, index_mapping: &mut ColIndexMapping, data_types: &mut HashMap<usize, DataType>, index: &mut usize, ) -> Option<PlanRef>

Trait Implementations§

fn apply(&self, plan: PlanRef) -> Option<PlanRef>

Apply the rule to the plan node. Read more

Auto Trait Implementations§

impl Freeze for TranslateApplyRule

impl RefUnwindSafe for TranslateApplyRule

impl Send for TranslateApplyRule

impl Sync for TranslateApplyRule

impl Unpin for TranslateApplyRule

impl UnwindSafe for TranslateApplyRule

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fn apply(&self, plan: PlanRef<C>) -> ApplyResult<PlanRef<C>>

Apply the rule to the plan node, which may return an unrecoverable error. Read more

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