Struct FederationOptimizerRule 

pub struct FederationOptimizerRule {}

An optimizer rule to identifying sub-plans to federate

The optimizer logic walks over the plan, look for the largest subtrees that only have TableScans from the same FederationProvider. There ‘largest sub-trees’ are passed to their respective FederationProvider::optimizer.

Implementations

impl FederationOptimizerRule

pub fn new() -> Self

Creates a new FederationOptimizerRule

Trait Implementations

impl Debug for FederationOptimizerRule

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for FederationOptimizerRule

fn default() -> FederationOptimizerRule

Returns the “default value” for a type.

impl OptimizerRule for FederationOptimizerRule

fn rewrite( &self, plan: LogicalPlan, config: &dyn OptimizerConfig, ) -> Result<Transformed<LogicalPlan>>

Try to rewrite plan to an optimized form, returning Transformed::yes if the plan was rewritten and Transformed::no if it was not.

Note: this function is only called if Self::supports_rewrite returns true. Otherwise the Optimizer calls [Self::try_optimize]

fn supports_rewrite(&self) -> bool

👎Deprecated since 47.0.0: This method is no longer used

Does this rule support rewriting owned plans (rather than by reference)?

fn name(&self) -> &str

A human readable name for this optimizer rule

fn apply_order(&self) -> Option<ApplyOrder>

How should the rule be applied by the optimizer? See comments on ApplyOrder for details.