Struct PredicateRewriter 

pub struct PredicateRewriter {
    unhandled_hook: Arc<dyn UnhandledPredicateHook>,
}

Rewrite a predicate expression in terms of statistics (min/max/null_counts) for use as a PruningPredicate.

Fields

unhandled_hook: Arc<dyn UnhandledPredicateHook>

Implementations

impl PredicateRewriter

pub fn new() -> PredicateRewriter

Create a new PredicateRewriter

pub fn with_unhandled_hook( self, unhandled_hook: Arc<dyn UnhandledPredicateHook>, ) -> PredicateRewriter

Set the unhandled hook to be used when a predicate can not be rewritten

pub fn rewrite_predicate_to_statistics_predicate( &self, expr: &Arc<dyn PhysicalExpr>, schema: &Schema, ) -> Arc<dyn PhysicalExpr>

Translate logical filter expression into pruning predicate expression that will evaluate to FALSE if it can be determined no rows between the min/max values could pass the predicates.

Any predicates that can not be translated will be passed to unhandled_hook.

Returns the pruning predicate as an PhysicalExpr

Notice: Does not handle phys_expr::InListExpr greater than 20, which will fall back to calling unhandled_hook

Trait Implementations

impl Default for PredicateRewriter

fn default() -> PredicateRewriter

Returns the “default value” for a type.