Struct mz_transform::will_distinct::WillDistinct

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pub struct WillDistinct;
Expand description

Pushes down the information that a collection will be subjected to a Distinct on specific columns.

This intends to recognize idiomatic stacks of UNION from SQL, which look like Distinct over Union, potentially over other Distinct expressions. It is only able to see patterns of DISTINCT UNION DISTINCT, .. and other operators in between will prevent the necessary insight to remove the second DISTINCT.

There are other potential optimizations, for example fusing multiple reads of the same source, where distinctness may mean they could be a single read (with additional requirements).

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impl WillDistinct

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fn apply(&self, expr: &mut MirRelationExpr, derived: DerivedView<'_>)

Trait Implementations§

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impl Debug for WillDistinct

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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 WillDistinct

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fn default() -> WillDistinct

Returns the “default value” for a type. Read more
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impl Transform for WillDistinct

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fn transform( &self, relation: &mut MirRelationExpr, ctx: &mut TransformCtx<'_>, ) -> Result<(), TransformError>

Transform a relation into a functionally equivalent relation.
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fn debug(&self) -> String

A string describing the transform. Read more

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