pub(super) struct Context {
arrangements: BTreeMap<Id, AvailableCollections>,
next_lir_id: LirId,
debug_info: LirDebugInfo,
enable_reduce_mfp_fusion: bool,
}
Fields§
§arrangements: BTreeMap<Id, AvailableCollections>
Known bindings to (possibly arranged) collections.
next_lir_id: LirId
Tracks the next available LirId
.
debug_info: LirDebugInfo
Information to print along with error messages.
enable_reduce_mfp_fusion: bool
Whether to enable fusion of MFPs in reductions.
Implementations§
Source§impl Context
impl Context
pub fn new(debug_name: String, features: &OptimizerFeatures) -> Self
fn allocate_lir_id(&mut self) -> LirId
pub fn lower<T: Timestamp>( self, desc: DataflowDescription<OptimizedMirRelationExpr>, ) -> Result<DataflowDescription<Plan<T>>, String>
Sourcefn lower_mir_expr<T: Timestamp>(
&mut self,
expr: &MirRelationExpr,
) -> Result<(Plan<T>, AvailableCollections), String>
fn lower_mir_expr<T: Timestamp>( &mut self, expr: &MirRelationExpr, ) -> Result<(Plan<T>, AvailableCollections), String>
This method converts a MirRelationExpr into a plan that can be directly rendered.
The rough structure is that we repeatedly extract map/filter/project operators
from each expression we see, bundle them up as a MapFilterProject
object, and
then produce a plan for the combination of that with the next operator.
The method accesses self.arrangements
, which it will locally add to and remove from for
Let
bindings (by the end of the call it should contain the same bindings as when it
started).
The result of the method is both a Plan
, but also a list of arrangements that
are certain to be produced, which can be relied on by the next steps in the plan.
Each of the arrangement keys is associated with an MFP that must be applied if that
arrangement is used, to back out the permutation associated with that arrangement.
An empty list of arrangement keys indicates that only a Collection
stream can
be assumed to exist.
fn lower_mir_expr_stack_safe<T>(
&mut self,
expr: &MirRelationExpr,
) -> Result<(Plan<T>, AvailableCollections), String>where
T: Timestamp,
Sourcefn lower_reduce<T: Timestamp>(
&mut self,
input: &MirRelationExpr,
group_key: &Vec<MirScalarExpr>,
aggregates: &Vec<AggregateExpr>,
monotonic: &bool,
expected_group_size: &Option<u64>,
mfp_on_top: &mut MapFilterProject,
fused_unnest_list: bool,
) -> Result<(Plan<T>, AvailableCollections), String>
fn lower_reduce<T: Timestamp>( &mut self, input: &MirRelationExpr, group_key: &Vec<MirScalarExpr>, aggregates: &Vec<AggregateExpr>, monotonic: &bool, expected_group_size: &Option<u64>, mfp_on_top: &mut MapFilterProject, fused_unnest_list: bool, ) -> Result<(Plan<T>, AvailableCollections), String>
Lowers a Reduce
with the given fields and an mfp_on_top
, which is the MFP that is
originally on top of the Reduce
. This MFP, or a part of it, might be fused into the
Reduce
, in which case mfp_on_top
is mutated to be the residual MFP, i.e., what was not
fused.
Sourcepub fn arrange_by<T>(
&mut self,
plan: Plan<T>,
collections: AvailableCollections,
old_collections: &AvailableCollections,
arity: usize,
) -> Plan<T>
pub fn arrange_by<T>( &mut self, plan: Plan<T>, collections: AvailableCollections, old_collections: &AvailableCollections, arity: usize, ) -> Plan<T>
Replace the plan with another one that has the collection in some additional forms.
Auto Trait Implementations§
impl Freeze for Context
impl RefUnwindSafe for Context
impl Send for Context
impl Sync for Context
impl Unpin for Context
impl UnwindSafe for Context
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