Struct mz_expr::scalar::FilterCharacteristics

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pub struct FilterCharacteristics {
    literal_equality: bool,
    like: bool,
    is_null: bool,
    literal_inequality: usize,
    any_filter: bool,
}
Expand description

Filter characteristics that are used for ordering join inputs. This can be created for a Vec<MirScalarExpr>, which represents an AND of predicates.

The fields are ordered based on heuristic assumptions about their typical selectivity, so that Ord gives the right ordering for join inputs. Bigger is better, i.e., will tend to come earlier than other inputs.

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§literal_equality: bool§like: bool§is_null: bool§literal_inequality: usize§any_filter: bool

Any filter, except ones involving IS NOT NULL, because those are too common. Can be true by itself, or any other field being true can also make this true. NOT LIKE is only in this category. != is only in this category. NOT (a = b) is turned into != by reduce before us!

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Trait Implementations§

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impl BitOrAssign for FilterCharacteristics

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fn bitor_assign(&mut self, rhs: Self)

Performs the |= operation. Read more
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impl Clone for FilterCharacteristics

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fn clone(&self) -> FilterCharacteristics

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 FilterCharacteristics

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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<'de> Deserialize<'de> for FilterCharacteristics

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Hash for FilterCharacteristics

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl MzReflect for FilterCharacteristics

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fn add_to_reflected_type_info(rti: &mut ReflectedTypeInfo)

Adds names and types of the fields of the struct or enum to rti. Read more
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impl Ord for FilterCharacteristics

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fn cmp(&self, other: &FilterCharacteristics) -> 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 FilterCharacteristics

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fn eq(&self, other: &FilterCharacteristics) -> 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 FilterCharacteristics

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fn partial_cmp(&self, other: &FilterCharacteristics) -> 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 Serialize for FilterCharacteristics

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Eq for FilterCharacteristics

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impl StructuralPartialEq for FilterCharacteristics

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

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

🔬This is a nightly-only experimental API. (clone_to_uninit)
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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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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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Returns the argument unchanged.

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