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Coalesce

drizzle_core::scope

Struct Coalesce 

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pub struct Coalesce<A, B>(/* private fields */);
Expand description

Sources-tree node that is NULL only when both sides are NULL, as in COALESCE(a, b).

Trait Implementations§

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impl<A, B> Clone for Coalesce<A, B>

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<A, B> Copy for Coalesce<A, B>

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impl<A, B> Debug for Coalesce<A, B>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<A, B> Default for Coalesce<A, B>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<Scope, A, B, ProofA, ProofB> SourcesIn<Scope, (ProofA, ProofB)> for Coalesce<A, B>
where A: SourcesIn<Scope, ProofA>, B: SourcesIn<Scope, ProofB>,

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type Nullable = <<A as SourcesIn<Scope, ProofA>>::Nullable as Nullability>::And<<B as SourcesIn<Scope, ProofB>>::Nullable>

Null when an outer join can make the expression NULL even though its declared nullability says otherwise.

Auto Trait Implementations§

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impl<A, B> Freeze for Coalesce<A, B>
where PhantomData<(A, B)>: Freeze,

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impl<A, B> RefUnwindSafe for Coalesce<A, B>
where PhantomData<(A, B)>: RefUnwindSafe,

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impl<A, B> Send for Coalesce<A, B>
where PhantomData<(A, B)>: Send,

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impl<A, B> Sync for Coalesce<A, B>
where PhantomData<(A, B)>: Sync,

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impl<A, B> Unpin for Coalesce<A, B>
where PhantomData<(A, B)>: Unpin,

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impl<A, B> UnsafeUnpin for Coalesce<A, B>
where PhantomData<(A, B)>: UnsafeUnpin,

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impl<A, B> UnwindSafe for Coalesce<A, B>
where PhantomData<(A, B)>: UnwindSafe,

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. 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<U> 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<List> ListIncludes<Nil, ()> for List

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impl<Mk> MarkerAggValidFor<()> for Mk

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = !

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, !>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> TypeEq<T> for T