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KGroupedTable

krabka_client_streams::dsl

Struct KGroupedTable 

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pub struct KGroupedTable<KR, VR> { /* private fields */ }
Expand description

Handle produced by KTable::group_by[_explicit].

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impl<KR, VR> KGroupedTable<KR, VR>
where KR: Any + Send + Sync + Clone + PartialEq, VR: Any + Send + Sync + Clone,

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pub fn count_explicit<KS, VS>( self, materialized: impl Into<Materialized<KS, VS>>, ) -> KTable<KR, i64, KS, VS>
where KS: Serde<KR> + Clone + 'static, VS: Serde<i64> + Clone + 'static,

count into a materialized KTable<KR, i64>.

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pub fn reduce_explicit<KS, VS, Add, Sub>( self, adder: Add, subtractor: Sub, materialized: impl Into<Materialized<KS, VS>>, ) -> KTable<KR, VR, KS, VS>
where VR: Default, KS: Serde<KR> + Clone + 'static, VS: Serde<VR> + Clone + 'static, Add: Fn(&VR, &VR) -> VR + Clone + Send + Sync + 'static, Sub: Fn(&VR, &VR) -> VR + Clone + Send + Sync + 'static,

reduce folds each group with adder and undoes with subtractor.

The result type stays VR, and the first value for a group seeds it. An empty group starts at VR::default(), and adder(default, first) equals first for the additive reduce. This is exact JVM parity. Use aggregate() as the escape hatch for anything else.

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pub fn aggregate_explicit<KS, VS, T, I, Add, Sub>( self, init: I, adder: Add, subtractor: Sub, materialized: impl Into<Materialized<KS, VS>>, ) -> KTable<KR, T, KS, VS>
where T: Any + Send + Clone, KS: Serde<KR> + Clone + 'static, VS: Serde<T> + Clone + 'static, I: Fn() -> T + Clone + Send + Sync + 'static, Add: Fn(&KR, &VR, T) -> T + Clone + Send + Sync + 'static, Sub: Fn(&KR, &VR, T) -> T + Clone + Send + Sync + 'static,

aggregate is the general subtract-and-add aggregation into a KTable<KR, T>.

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pub fn count( self, store_name: impl Into<String>, ) -> KTable<KR, i64, <KR as DefaultSerde>::Serde, I64Serde>
where KR: DefaultSerde, <KR as DefaultSerde>::Serde: Serde<KR> + Clone,

count with default serdes.

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pub fn aggregate<T, I, Add, Sub>( self, init: I, adder: Add, subtractor: Sub, store_name: impl Into<String>, ) -> KTable<KR, T, <KR as DefaultSerde>::Serde, <T as DefaultSerde>::Serde>
where T: DefaultSerde + Any + Send + Clone, KR: DefaultSerde, <KR as DefaultSerde>::Serde: Serde<KR> + Clone, <T as DefaultSerde>::Serde: Serde<T> + Clone, I: Fn() -> T + Clone + Send + Sync + 'static, Add: Fn(&KR, &VR, T) -> T + Clone + Send + Sync + 'static, Sub: Fn(&KR, &VR, T) -> T + Clone + Send + Sync + 'static,

aggregate with default serdes.

Auto Trait Implementations§

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impl<KR, VR> !RefUnwindSafe for KGroupedTable<KR, VR>

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impl<KR, VR> !Send for KGroupedTable<KR, VR>

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impl<KR, VR> !Sync for KGroupedTable<KR, VR>

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impl<KR, VR> !UnwindSafe for KGroupedTable<KR, VR>

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impl<KR, VR> Freeze for KGroupedTable<KR, VR>

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impl<KR, VR> Unpin for KGroupedTable<KR, VR>

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impl<KR, VR> UnsafeUnpin for KGroupedTable<KR, VR>

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