risingwave_stream::executor::join::hash_join

Struct HashValueWrapper

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struct HashValueWrapper(Option<Box<JoinEntryState>>);
Expand description

The wrapper for JoinEntryState which should be Some most of the time in the hash table.

When the executor is operating on the specific entry of the map, it can hold the ownership of the entry by taking the value out of the Option, instead of holding a mutable reference to the map, which can make the compiler happy.

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§0: Option<Box<JoinEntryState>>

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impl HashValueWrapper

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const MESSAGE: &'static str = "the state should always be `Some`"

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pub fn take(&mut self) -> Box<JoinEntryState>

Take the value out of the wrapper. Panic if the value is None.

Trait Implementations§

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impl Deref for HashValueWrapper

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type Target = Box<JoinEntryState>

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl DerefMut for HashValueWrapper

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl EstimateSize for HashValueWrapper

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fn estimated_heap_size(&self) -> usize

The estimated heap size of the current struct in bytes.
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fn estimated_size(&self) -> usize
where Self: Sized,

The estimated total size of the current struct in bytes, including the estimated_heap_size and the size of Self.

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