pub struct RedundantJoin { /* private fields */ }
Expand description

Remove redundant collections of distinct elements from joins.

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impl RedundantJoin

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pub fn action( &self, relation: &mut MirRelationExpr, ctx: &mut ProvInfoCtx ) -> Result<Vec<ProvInfo>, TransformError>

Remove redundant collections of distinct elements from joins.

This method tracks “provenance” information for each collections, those being column-wise relationships to identified collections (either imported collections, or let-bound collections). These relationships state that when projected on to these columns, the records of the one collection are contained in the records of the identified collection.

This provenance information is then used for the MirRelationExpr::Join variant to remove “redundant” joins, those that can be determined to neither restrict nor augment one of the input relations. Consult the find_redundancy method and its documentation for more detail.

Trait Implementations§

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impl CheckedRecursion for RedundantJoin

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fn recursion_guard(&self) -> &RecursionGuard

Extracts a reference to the recursion guard embedded within the type.
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fn checked_recur<F, T, E>(&self, f: F) -> Result<T, E>
where F: FnOnce(&Self) -> Result<T, E>, E: From<RecursionLimitError>,

Checks whether it is safe to recur and calls f if so. Read more
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fn checked_recur_mut<F, T, E>(&mut self, f: F) -> Result<T, E>

Like CheckedRecursion::checked_recur, but operates on a mutable reference to Self.
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impl Debug for RedundantJoin

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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 RedundantJoin

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fn default() -> RedundantJoin

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

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fn transform( &self, relation: &mut MirRelationExpr, _: &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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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

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where T: ?Sized,

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fn borrow(&self) -> &T

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fn borrow_mut(&mut self) -> &mut T

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impl<T, U> CastInto<U> for T
where U: CastFrom<T>,

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fn cast_into(self) -> U

Performs the cast.
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impl<T> Conv for T

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fn conv<T>(self) -> T
where Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> FmtForward for T

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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>
where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>
where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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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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fn with_context(self, otel_cx: Context) -> WithContext<Self>

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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where U: From<T>,

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Calls U::from(self).

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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
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Pipes by value. This is generally the method you want to use. Read more
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where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

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where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

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where Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

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const ALIGN: usize = _

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type Output = T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

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where Self: Borrow<B>, B: ?Sized,

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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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