pub struct PredicatePushdown { /* private fields */ }
Expand description
Pushes predicates down through other operators.
Implementations§
source§impl PredicatePushdown
impl PredicatePushdown
sourcepub fn action(
&self,
relation: &mut MirRelationExpr,
get_predicates: &mut BTreeMap<Id, BTreeSet<MirScalarExpr>>
) -> Result<(), TransformError>
pub fn action( &self, relation: &mut MirRelationExpr, get_predicates: &mut BTreeMap<Id, BTreeSet<MirScalarExpr>> ) -> Result<(), TransformError>
Predicate pushdown
This method looks for opportunities to push predicates toward
sources of data. Primarily, this is the Filter
expression,
and moving its predicates through the operators it contains.
In addition, the method accumulates the intersection of predicates
applied to each Get
expression, so that the predicate can
then be pushed through to a Let
binding, or to the external
source of the data if the Get
binds to another view.
sourcepub fn push_filters_through_join(
input_mapper: &JoinInputMapper,
equivalences: &Vec<Vec<MirScalarExpr>>,
predicates: Vec<MirScalarExpr>
) -> (Vec<MirScalarExpr>, Vec<Vec<MirScalarExpr>>)
pub fn push_filters_through_join( input_mapper: &JoinInputMapper, equivalences: &Vec<Vec<MirScalarExpr>>, predicates: Vec<MirScalarExpr> ) -> (Vec<MirScalarExpr>, Vec<Vec<MirScalarExpr>>)
Returns (<predicates to retain>, <predicates to push at each input>)
.
sourcepub fn push_filters_through_map(
map_exprs: &Vec<MirScalarExpr>,
predicates: &mut Vec<MirScalarExpr>,
input_arity: usize,
all_errors: bool
) -> Result<(Vec<MirScalarExpr>, Vec<MirScalarExpr>), TransformError>
pub fn push_filters_through_map( map_exprs: &Vec<MirScalarExpr>, predicates: &mut Vec<MirScalarExpr>, input_arity: usize, all_errors: bool ) -> Result<(Vec<MirScalarExpr>, Vec<MirScalarExpr>), TransformError>
Computes “safe” predicates to push through a Map.
In the case of a Filter { Map {…} }, we can always push down the Filter by inlining expressions from the Map. We don’t want to do this in general, however, since general inlining can result in exponential blowup in the size of expressions, so we only do this in the case where the size after inlining is below a certain limit.
Returns the predicates that can be pushed down, followed by ones that cannot.
Trait Implementations§
source§impl CheckedRecursion for PredicatePushdown
impl CheckedRecursion for PredicatePushdown
source§fn recursion_guard(&self) -> &RecursionGuard
fn recursion_guard(&self) -> &RecursionGuard
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fn checked_recur_mut<F, T, E>(&mut self, f: F) -> Result<T, E>
CheckedRecursion::checked_recur
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.source§impl Debug for PredicatePushdown
impl Debug for PredicatePushdown
source§impl Default for PredicatePushdown
impl Default for PredicatePushdown
source§fn default() -> PredicatePushdown
fn default() -> PredicatePushdown
source§impl Transform for PredicatePushdown
impl Transform for PredicatePushdown
source§fn transform(
&self,
relation: &mut MirRelationExpr,
_: &mut TransformCtx<'_>
) -> Result<(), TransformError>
fn transform( &self, relation: &mut MirRelationExpr, _: &mut TransformCtx<'_> ) -> Result<(), TransformError>
Auto Trait Implementations§
impl !Freeze for PredicatePushdown
impl !RefUnwindSafe for PredicatePushdown
impl Send for PredicatePushdown
impl !Sync for PredicatePushdown
impl Unpin for PredicatePushdown
impl UnwindSafe for PredicatePushdown
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