Struct polars_lazy::frame::OptState

pub struct OptState {
Show 13 fields pub projection_pushdown: bool, pub predicate_pushdown: bool, pub cluster_with_columns: bool, pub type_coercion: bool, pub simplify_expr: bool, pub file_caching: bool, pub slice_pushdown: bool, pub comm_subplan_elim: bool, pub comm_subexpr_elim: bool, pub streaming: bool, pub eager: bool, pub fast_projection: bool, pub row_estimate: bool,
}
Expand description

State of the allowed optimizations

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§projection_pushdown: bool

Only read columns that are used later in the query.

§predicate_pushdown: bool

Apply predicates/filters as early as possible.

§cluster_with_columns: bool

Cluster sequential with_columns calls to independent calls.

§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.

§comm_subplan_elim: bool
Available on crate feature cse only.

Run common-subplan-elimination. This elides duplicate plans and caches their outputs.

§comm_subexpr_elim: bool
Available on crate feature cse only.

Run common-subexpression-elimination. This elides duplicate expressions and caches their outputs.

§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§

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impl Clone for OptState

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fn clone(&self) -> OptState

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for OptState

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

Formats the value using the given formatter. Read more
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impl Default for OptState

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fn default() -> OptState

Returns the “default value” for a type. Read more
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impl Copy for OptState

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