Struct mz_transform::attribute::NonNegative
source · pub struct NonNegative {
pub results: Vec<bool>,
/* private fields */
}
Expand description
Traverses a MirRelationExpr
tree and figures out whether for subtree
the sum of all diffs up to a specific time for any record can be a
negative value.
The results for each subtree are accumulated in a bottom-up order
in NonNegative::results
.
This method is a conservative approximation and is known to miss not-hard cases.
It assumes that all Get
s to global ids correspond to collections without negative
multiplicities. Local let bindings’ non-negativity results are stored in env
.
Fields§
§results: Vec<bool>
A vector of results for all nodes in the visited tree in post-visit order.
Trait Implementations§
source§impl Attribute for NonNegative
impl Attribute for NonNegative
source§fn derive(&mut self, expr: &MirRelationExpr, deps: &DerivedAttributes<'_>)
fn derive(&mut self, expr: &MirRelationExpr, deps: &DerivedAttributes<'_>)
Derive an attribute.
source§fn schedule_env_tasks(&mut self, expr: &MirRelationExpr)
fn schedule_env_tasks(&mut self, expr: &MirRelationExpr)
Schedule environment maintenance tasks. Read more
source§fn handle_env_tasks(&mut self)
fn handle_env_tasks(&mut self)
Handle scheduled environment maintenance tasks. Read more
source§fn add_dependencies(builder: &mut DerivedAttributesBuilder<'_>)where
Self: Sized,
fn add_dependencies(builder: &mut DerivedAttributesBuilder<'_>)where
Self: Sized,
The attribute ids of all other attributes that this attribute depends on.
source§fn get_results(&self) -> &Vec<Self::Value>
fn get_results(&self) -> &Vec<Self::Value>
Attributes for each subexpression, visited in post-order.
source§fn get_results_mut(&mut self) -> &mut Vec<Self::Value>
fn get_results_mut(&mut self) -> &mut Vec<Self::Value>
Mutable attributes for each subexpression, visited in post-order.
source§impl<'c> AttributeContainer<NonNegative> for AttributeStore<'c>
impl<'c> AttributeContainer<NonNegative> for AttributeStore<'c>
source§fn push_attribute(&mut self, value: NonNegative)
fn push_attribute(&mut self, value: NonNegative)
Push the attribute to the store.
source§fn take_attribute(&mut self) -> Option<NonNegative>
fn take_attribute(&mut self) -> Option<NonNegative>
Take the attribute from the store, leaving its slot empty.
source§fn attribute_is_enabled(&self) -> bool
fn attribute_is_enabled(&self) -> bool
Check if the attribute is enabled.
source§fn get_attribute(&self) -> Option<&NonNegative>
fn get_attribute(&self) -> Option<&NonNegative>
Get an immutable reference to the attribute.
source§fn get_mut_attribute(&mut self) -> Option<&mut NonNegative>
fn get_mut_attribute(&mut self) -> Option<&mut NonNegative>
Get a mutable reference to the attribute.
source§impl Default for NonNegative
impl Default for NonNegative
source§fn default() -> NonNegative
fn default() -> NonNegative
Returns the “default value” for a type. Read more
Auto Trait Implementations§
impl Freeze for NonNegative
impl RefUnwindSafe for NonNegative
impl Send for NonNegative
impl Sync for NonNegative
impl Unpin for NonNegative
impl UnwindSafe for NonNegative
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