pub struct RedundantJoin {
recursion_guard: RecursionGuard,
}
Expand description
Remove redundant collections of distinct elements from joins.
Fields§
§recursion_guard: RecursionGuard
Implementations§
Source§impl RedundantJoin
impl RedundantJoin
Sourcepub fn action(
&self,
relation: &mut MirRelationExpr,
ctx: &mut ProvInfoCtx,
) -> Result<Vec<ProvInfo>, TransformError>
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§
Source§impl CheckedRecursion for RedundantJoin
impl CheckedRecursion for RedundantJoin
Source§fn recursion_guard(&self) -> &RecursionGuard
fn recursion_guard(&self) -> &RecursionGuard
Source§fn checked_recur<F, T, E>(&self, f: F) -> Result<T, E>
fn checked_recur<F, T, E>(&self, f: F) -> Result<T, E>
f
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fn checked_recur_mut<F, T, E>(&mut self, f: F) -> Result<T, E>
CheckedRecursion::checked_recur
, but operates on a mutable
reference to Self
.Source§impl Debug for RedundantJoin
impl Debug for RedundantJoin
Source§impl Default for RedundantJoin
impl Default for RedundantJoin
Source§fn default() -> RedundantJoin
fn default() -> RedundantJoin
Source§impl Transform for RedundantJoin
impl Transform for RedundantJoin
Source§fn name(&self) -> &'static str
fn name(&self) -> &'static str
Source§fn actually_perform_transform(
&self,
relation: &mut MirRelationExpr,
_: &mut TransformCtx<'_>,
) -> Result<(), TransformError>
fn actually_perform_transform( &self, relation: &mut MirRelationExpr, _: &mut TransformCtx<'_>, ) -> Result<(), TransformError>
Source§fn transform(
&self,
relation: &mut MirRelationExpr,
args: &mut TransformCtx<'_>,
) -> Result<(), TransformError>
fn transform( &self, relation: &mut MirRelationExpr, args: &mut TransformCtx<'_>, ) -> Result<(), TransformError>
Auto Trait Implementations§
impl !Freeze for RedundantJoin
impl !RefUnwindSafe for RedundantJoin
impl Send for RedundantJoin
impl !Sync for RedundantJoin
impl Unpin for RedundantJoin
impl UnwindSafe for RedundantJoin
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