Struct mz_repr::RowArena

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pub struct RowArena { /* private fields */ }
Expand description

RowArena is used to hold on to temporary Rows for functions like eval that need to create complex Datums but don’t have a Row to put them in yet.

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impl RowArena

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pub fn new() -> Self

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pub fn push_bytes<'a>(&'a self, bytes: Vec<u8>) -> &'a [u8]

Take ownership of bytes for the lifetime of the arena.

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pub fn push_string<'a>(&'a self, string: String) -> &'a str

Take ownership of string for the lifetime of the arena.

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pub fn push_unary_row<'a>(&'a self, row: Row) -> Datum<'a>

Take ownership of row for the lifetime of the arena, returning a reference to the first datum in the row.

If we had an owned datum type, this method would be much clearer, and would be called push_owned_datum.

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pub fn make_datum<'a, F>(&'a self, f: F) -> Datum<'a>
where F: FnOnce(&mut RowPacker<'_>),

Convenience function to make a new Row containing a single datum, and take ownership of it for the lifetime of the arena

let arena = RowArena::new();
let datum = arena.make_datum(|packer| {
  packer.push_list(&[Datum::String("hello"), Datum::String("world")]);
});
assert_eq!(datum.unwrap_list().iter().collect::<Vec<_>>(), vec![Datum::String("hello"), Datum::String("world")]);
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pub fn make_datum_nested<'a, F>(&'a self, f: F) -> DatumNested<'a>
where F: FnOnce(&mut RowPacker<'_>),

Convenience function identical to make_datum but instead returns a DatumNested.

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pub fn try_make_datum<'a, F, E>(&'a self, f: F) -> Result<Datum<'a>, E>
where F: FnOnce(&mut RowPacker<'_>) -> Result<(), E>,

Like RowArena::make_datum, but the provided closure can return an error.

Trait Implementations§

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impl Debug for RowArena

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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 Default for RowArena

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fn default() -> RowArena

Returns the “default value” for a type. Read more

Auto Trait 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, U> CastInto<U> for T
where U: CastFrom<T>,

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fn cast_into(self) -> U

Performs the cast.
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fn from(t: T) -> T

Returns the argument unchanged.

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fn with_context(self, otel_cx: Context) -> WithContext<Self>

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

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impl<T> IntoRequest<T> for T

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fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<P, R> ProtoType<R> for P
where R: RustType<P>,

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impl<T> PushInto<Vec<T>> for T

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fn push_into(self, target: &mut Vec<T>)

Push self into the target container.
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
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type Error = Infallible

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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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where S: Into<Dispatch>,

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