mz_repr::explain

Struct UsedIndexes

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pub struct UsedIndexes(BTreeSet<(GlobalId, Vec<IndexUsageType>)>);
Expand description

A set of indexes that are used in the explained plan.

Each element consists of the following components:

  1. The id of the index.
  2. A vector of IndexUsageType denoting how the index is used in the plan.

Using a BTreeSet here ensures a deterministic iteration order, which in turn ensures that the corresponding EXPLAIN output is deterministic as well.

Tuple Fields§

§0: BTreeSet<(GlobalId, Vec<IndexUsageType>)>

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Trait Implementations§

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impl Clone for UsedIndexes

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fn clone(&self) -> UsedIndexes

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 UsedIndexes

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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 Default for UsedIndexes

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fn default() -> UsedIndexes

Returns the “default value” for a type. Read more
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impl<'a, C> DisplayText<C> for UsedIndexes
where C: AsMut<Indent> + AsRef<&'a dyn ExprHumanizer>,

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

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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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Performs the cast.
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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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const ALIGN: usize = _

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