Enum mz_expr::interpret::TraceSummary

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pub enum TraceSummary {
    Constant,
    Dynamic,
    Unknown,
}
Expand description

A summary type for the Trace interpreter.

The ordering of this type is meaningful: the “smaller” the summary, the more information we have about the possible values of the expression. This means we can eg. use max in the interpreter below to find the summary for a function-call expression based on the summaries of its arguments.

Variants§

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Constant

The expression is constant: we can evaluate it without any runtime information. This corresponds to a ResultSpec of a single value.

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Dynamic

The expression depends on runtime information, but in “predictable” way… ie. if we know the range of possible values for all columns and unmaterializable functions, we can predict the possible values of the output. This corresponds to a ResultSpec of a perhaps range of values.

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Unknown

The expression depends on runtime information in an unpredictable way. This corresponds to a ResultSpec::value_all() or something similarly vague.

Implementations§

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impl TraceSummary

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fn apply_fn(self, pushdownable: bool) -> Self

We say that a function is “pushdownable” for a particular argument if ColumnSpecs can determine the spec of the function’s output given the input spec for that argument. (In practice, this is true when either the function is monotone in that argument or it’s been special-cased in the interpreter.)

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pub fn pushdownable(self) -> bool

We say that an expression is “pushdownable” if it’s either constant or dynamic.

Trait Implementations§

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impl Clone for TraceSummary

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fn clone(&self) -> TraceSummary

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 TraceSummary

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

Formats the value using the given formatter. Read more
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impl Ord for TraceSummary

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fn cmp(&self, other: &TraceSummary) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for TraceSummary

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fn eq(&self, other: &TraceSummary) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for TraceSummary

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fn partial_cmp(&self, other: &TraceSummary) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Copy for TraceSummary

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impl Eq for TraceSummary

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impl StructuralPartialEq for TraceSummary

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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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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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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, U> CastInto<U> for T
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fn cast_into(self) -> U

Performs the cast.
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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> FromRef<T> for T
where T: Clone,

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fn from_ref(input: &T) -> T

Converts to this type from a reference to the input type.
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Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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Calls U::from(self).

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

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Wrap the input message T in a tonic::Request
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Override the configuration represented by Self with values from the given layer.
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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

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impl<T> PreferredContainer for T
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type Container = Vec<T>

The preferred container for the type.
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impl<T> ProgressEventTimestamp for T
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fn as_any(&self) -> &(dyn Any + 'static)

Upcasts this ProgressEventTimestamp to Any. Read more
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fn type_name(&self) -> &'static str

Returns the name of the concrete type of this object. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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fn plus_equals(&mut self, rhs: &&'a S)

The method of std::ops::AddAssign, for types that do not implement AddAssign.
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