Struct polars_lazy::frame::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 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.

§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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impl<T> Any for T
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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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fn __clone_box(&self, _: Private) -> *mut ()

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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Drops the object pointed to by the given pointer. Read more
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type Owned = T

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Performs the conversion.
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type Error = <U as TryFrom<T>>::Error

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fn vzip(self) -> V

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