Struct ParameterScanOperator

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pub struct ParameterScanOperator { /* private fields */ }

Expand description

Operator that emits a single row from externally injected parameter values.

This is the leaf operator for inner plans in correlated subqueries. The ApplyOperator sets parameter values via the shared ParameterState before each inner plan execution.

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impl ParameterScanOperator

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pub fn new(state: Arc<ParameterState>) -> Self

Creates a new parameter scan operator.

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pub fn state(&self) -> &Arc<ParameterState>

Returns the shared parameter state (for wiring with Apply).

Trait Implementations§

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impl Operator for ParameterScanOperator

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fn next(&mut self) -> OperatorResult

Pulls the next batch of data. Returns None when exhausted.

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fn reset(&mut self)

Resets to initial state so you can iterate again.

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fn name(&self) -> &'static str

Returns a name for debugging/explain output.

Auto Trait Implementations§

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impl !UnwindSafe for ParameterScanOperator

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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