pub struct FoldConstants {
pub limit: Option<usize>,
}
Expand description
Replace operators on constant collections with constant collections.
Fields§
§limit: Option<usize>
An optional maximum size, after which optimization can cease.
The None
value here indicates no maximum size, but does not
currently guarantee that any constant expression will be reduced
to a MirRelationExpr::Constant
variant.
Implementations§
Source§impl FoldConstants
impl FoldConstants
Sourcepub fn action(
&self,
relation: &mut MirRelationExpr,
relation_type: &mut SqlRelationType,
) -> Result<(), TransformError>
pub fn action( &self, relation: &mut MirRelationExpr, relation_type: &mut SqlRelationType, ) -> Result<(), TransformError>
Replace operators on constants collections with constant collections.
This transform will cease optimization if it encounters constant collections
that are larger than self.limit
, if that is set. It is not guaranteed that
a constant input within the limit will be reduced to a Constant
variant.
fn fold_reduce_constant( group_key: &[MirScalarExpr], aggregates: &[AggregateExpr], rows: &[(Row, Diff)], limit: Option<usize>, ) -> Option<Result<Vec<(Row, Diff)>, EvalError>>
fn fold_topk_constant<'a>( group_key: &[usize], order_key: &[ColumnOrder], limit: &Option<Diff>, offset: &usize, rows: &'a mut [(Row, Diff)], )
fn fold_flat_map_constant( func: &TableFunc, exprs: &[MirScalarExpr], rows: &[(Row, Diff)], limit: Option<usize>, ) -> Result<Option<Vec<(Row, Diff)>>, EvalError>
fn fold_filter_constant( predicates: &[MirScalarExpr], rows: &[(Row, Diff)], ) -> Result<Vec<(Row, Diff)>, EvalError>
Trait Implementations§
Source§impl Debug for FoldConstants
impl Debug for FoldConstants
Source§impl Transform for FoldConstants
impl Transform for FoldConstants
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 FoldConstants
impl RefUnwindSafe for FoldConstants
impl Send for FoldConstants
impl Sync for FoldConstants
impl Unpin for FoldConstants
impl UnwindSafe for FoldConstants
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