Struct polars::prelude::OptState

pub struct OptState {
    pub projection_pushdown: bool,
    pub predicate_pushdown: bool,
    pub type_coercion: bool,
    pub simplify_expr: bool,
    pub file_caching: bool,
    pub slice_pushdown: bool,
    pub streaming: bool,
    pub eager: bool,
    pub fast_projection: bool,
    pub row_estimate: bool,
}

Available on crate feature lazy only.

State of the allowed optimizations

Fields

projection_pushdown: bool

Only read columns that are used later in the query.

predicate_pushdown: bool

Apply predicates/filters as early as possible.

type_coercion: bool

Run many type coercion optimization rules until fixed point.

simplify_expr: bool

Run many expression optimization rules until fixed point.

file_caching: bool

Cache file reads.

slice_pushdown: bool

Pushdown slices/limits.

streaming: bool

Run nodes that are capably of doing so on the streaming engine.

eager: bool

Run every node eagerly. This turns off multi-node optimizations.

fast_projection: bool

Replace simple projections with a faster inlined projection that skips the expression engine.

row_estimate: bool

Try to estimate the number of rows so that joins can determine which side to keep in memory.

Trait Implementations

impl Clone for OptState

fn clone(&self) -> OptState

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for OptState

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

Formats the value using the given formatter.

impl Default for OptState

fn default() -> OptState

Returns the “default value” for a type.

impl Copy for OptState