pub struct Constraints {
pub lower: Vec<(Antichain<Timestamp>, Reason)>,
pub upper: Vec<(Antichain<Timestamp>, Reason)>,
}
Expand description
Constraints expressed on the timestamp of a query.
The constraints are expressed on the minimum and maximum values, resulting in a (possibly empty) interval of valid timestamps.
The constraints may be redundant, in the interest of providing more complete explanations, but they may also be minimized at any point without altering their behavior by removing redundant constraints.
When combined with a Preference
one can determine an
ideal timestamp to use.
Fields§
§lower: Vec<(Antichain<Timestamp>, Reason)>
Timestamps and reasons that impose an inclusive lower bound.
upper: Vec<(Antichain<Timestamp>, Reason)>
Timestamps and reasons that impose an inclusive upper bound.
Implementations§
Source§impl Constraints
impl Constraints
Sourcepub fn minimize(&mut self)
pub fn minimize(&mut self)
Remove constraints that are dominated by other constraints.
This removes redundant constraints, without removing constraints
that are “tight” in the sense that the interval would be
meaningfully different without them.
For example, two constraints at the same
time will both be retained, in the interest of full information.
But a lower bound constraint at time t
will be removed if there is a
constraint at time t + 1
(or any larger time).
Sourcepub fn lower_bound(&self) -> Antichain<Timestamp>
pub fn lower_bound(&self) -> Antichain<Timestamp>
An antichain equal to the least upper bound of lower bounds.
Sourcepub fn upper_bound(&self) -> Antichain<Timestamp>
pub fn upper_bound(&self) -> Antichain<Timestamp>
An antichain equal to the greatest lower bound of upper bounds.
Trait Implementations§
Source§impl Clone for Constraints
impl Clone for Constraints
Source§fn clone(&self) -> Constraints
fn clone(&self) -> Constraints
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for Constraints
impl Debug for Constraints
Source§impl Default for Constraints
impl Default for Constraints
Source§fn default() -> Constraints
fn default() -> Constraints
Source§impl<'de> Deserialize<'de> for Constraints
impl<'de> Deserialize<'de> for Constraints
Source§fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
Source§impl DisplayableInTimeline for Constraints
impl DisplayableInTimeline for Constraints
Auto Trait Implementations§
impl Freeze for Constraints
impl RefUnwindSafe for Constraints
impl Send for Constraints
impl Sync for Constraints
impl Unpin for Constraints
impl UnwindSafe for Constraints
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