Struct datafusion::optimizer::single_distinct_to_groupby::SingleDistinctToGroupBy

pub struct SingleDistinctToGroupBy {}

single distinct to group by optimizer rule

  SELECT F1(DISTINCT s),F2(DISTINCT s)
  ...
  GROUP BY k

  Into

  SELECT F1(alias1),F2(alias1)
  FROM (
    SELECT s as alias1, k ... GROUP BY s, k
  )
  GROUP BY k

Implementations

impl SingleDistinctToGroupBy

pub fn new() -> Self

Trait Implementations

impl Default for SingleDistinctToGroupBy

fn default() -> SingleDistinctToGroupBy

Returns the “default value” for a type.

impl OptimizerRule for SingleDistinctToGroupBy

fn optimize(
    &self,
    plan: &LogicalPlan,
    _execution_props: &ExecutionProps
) -> Result<LogicalPlan>

Rewrite plan to an optimized form

fn name(&self) -> &str

A human readable name for this optimizer rule