Struct datafusion_optimizer::replace_distinct_aggregate::ReplaceDistinctWithAggregate

pub struct ReplaceDistinctWithAggregate {}

Optimizer that replaces logical [Distinct] with a logical [Aggregate]

SELECT DISTINCT a, b FROM tab

Into

SELECT a, b FROM tab GROUP BY a, b

Optimizer that replaces logical [Distinct] with a logical [Aggregate]

Implementations

impl ReplaceDistinctWithAggregate

pub fn new() -> Self

Trait Implementations

impl Default for ReplaceDistinctWithAggregate

fn default() -> ReplaceDistinctWithAggregate

Returns the “default value” for a type.

impl OptimizerRule for ReplaceDistinctWithAggregate

fn try_optimize( &self, plan: &LogicalPlan, _config: &dyn OptimizerConfig ) -> Result<Option<LogicalPlan>>

Try and rewrite plan to an optimized form, returning None if the plan cannot be optimized by this rule.

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.