Struct EliminateJoin 

pub struct EliminateJoin;

Rewrites an inner join to a semi join when one input only filters the other, removes an outer join whose non-preserved side is unused and cannot multiply the preserved side’s rows, and replaces an always-false inner join with an empty relation.

Implementations

impl EliminateJoin

pub fn new() -> Self

Trait Implementations

impl Debug for EliminateJoin

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

Formats the value using the given formatter.

impl Default for EliminateJoin

fn default() -> EliminateJoin

Returns the “default value” for a type.

impl OptimizerRule for EliminateJoin

fn name(&self) -> &str

A human readable name for this optimizer rule

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.

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

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

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)?