Struct datafusion_optimizer::eliminate_nested_union::EliminateNestedUnion

pub struct EliminateNestedUnion;

An optimization rule that replaces nested unions with a single union.

Implementations

impl EliminateNestedUnion

pub fn new() -> Self

Trait Implementations

impl Default for EliminateNestedUnion

fn default() -> EliminateNestedUnion

Returns the “default value” for a type.

impl OptimizerRule for EliminateNestedUnion

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.

fn supports_rewrite(&self) -> bool

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

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

👎Deprecated since 40.0.0: please implement supports_rewrite and rewrite instead

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