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SelectivityMethod

velesdb_core::velesql

Enum SelectivityMethod 

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#[non_exhaustive]
pub enum SelectivityMethod {
    Histogram,
    Cardinality,
    Heuristic,
}
Expand description

Source of a selectivity estimate, used by EXPLAIN to report how a predicate’s selectivity was computed (issue #471, Devin finding 2).

Ordered by increasing noise / decreasing confidence:

  1. Histogram — derived from calibrated histogram buckets (most accurate).
  2. Cardinality — derived from distinct_count only (no distribution).
  3. Heuristic — hard-coded constant (e.g. 0.1 for Match, 0.05 for ContainsText) because the predicate type has no stats path at all.

For compound predicates (And/Or/Not/Group), the reported method is the worst case among children in the order above, so EXPLAIN never overstates its confidence.

Variants (Non-exhaustive)§

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
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Histogram

Selectivity computed from histogram bucket data.

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Cardinality

Selectivity computed from distinct_count cardinality (no histogram).

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Heuristic

Selectivity computed from a heuristic constant.

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impl SelectivityMethod

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pub const fn as_str(self) -> &'static str

Returns the EXPLAIN display label for this method.

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pub const fn worst(self, other: Self) -> Self

Returns the worst (least confident) of two methods.

Ordering: Heuristic > Cardinality > Histogram. Used to combine the methods of sub-predicates under And/Or/Not/Group so the reported method reflects the loosest child.

Trait Implementations§

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impl Clone for SelectivityMethod

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fn clone(&self) -> SelectivityMethod

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for SelectivityMethod

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impl Debug for SelectivityMethod

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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 Display for SelectivityMethod

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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 Eq for SelectivityMethod

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impl PartialEq for SelectivityMethod

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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 StructuralPartialEq for SelectivityMethod

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