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ViewNode

cjc_data::lazy

Enum ViewNode 

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pub enum ViewNode {
    Scan {
        df: Rc<DataFrame>,
    },
    Filter {
        input: Box<ViewNode>,
        predicate: DExpr,
    },
    Select {
        input: Box<ViewNode>,
        columns: Vec<String>,
    },
    Mutate {
        input: Box<ViewNode>,
        assignments: Vec<(String, DExpr)>,
    },
    Arrange {
        input: Box<ViewNode>,
        keys: Vec<ArrangeKey>,
    },
    GroupSummarise {
        input: Box<ViewNode>,
        group_keys: Vec<String>,
        aggregations: Vec<(String, TidyAgg)>,
    },
    Distinct {
        input: Box<ViewNode>,
        columns: Vec<String>,
    },
    Join {
        left: Box<ViewNode>,
        right: Box<ViewNode>,
        on: Vec<(String, String)>,
        kind: JoinType,
    },
}
Expand description

A node in the lazy evaluation tree.

Variants§

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Scan

Leaf: scan a base DataFrame.

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§df: Rc<DataFrame>
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Filter

Filter rows by predicate.

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§input: Box<ViewNode>
§predicate: DExpr
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Select

Project to subset of columns.

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§input: Box<ViewNode>
§columns: Vec<String>
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Mutate

Add/replace columns via expressions.

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§input: Box<ViewNode>
§assignments: Vec<(String, DExpr)>
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Arrange

Sort by keys.

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§input: Box<ViewNode>
§keys: Vec<ArrangeKey>
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GroupSummarise

Group + summarise (pipeline breaker).

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§input: Box<ViewNode>
§group_keys: Vec<String>
§aggregations: Vec<(String, TidyAgg)>
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Distinct

Distinct on columns.

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§input: Box<ViewNode>
§columns: Vec<String>
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Join

Join two inputs.

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§left: Box<ViewNode>
§right: Box<ViewNode>
§on: Vec<(String, String)>
§kind: JoinType

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impl ViewNode

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pub fn count_filters(&self) -> usize

Count the number of Filter nodes in the tree.

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pub fn is_filter_on_scan(&self) -> bool

Check if the immediate child (input) of the outermost node is a Scan. Useful for verifying predicate pushdown moved a filter near the scan.

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pub fn innermost(&self) -> &ViewNode

Return the innermost node (the leaf Scan) by walking input chains.

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pub fn kind(&self) -> &'static str

Return the node kind name (for test assertions).

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pub fn node_kinds(&self) -> Vec<&'static str>

Walk the plan tree depth-first and collect node kinds top-down.

Trait Implementations§

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impl Clone for ViewNode

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fn clone(&self) -> ViewNode

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

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

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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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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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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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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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.