RecordEncoder

Struct RecordEncoder 

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pub struct RecordEncoder {
    columns: Vec<FieldBinding>,
    prefix: Option<Prefix>,
}
Expand description

A pre-computed plan for encoding a RecordBatch to Avro.

Derived from an Avro schema and an Arrow schema. It maps top-level Avro fields to Arrow columns and contains a nested encoding plan for each column.

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§columns: Vec<FieldBinding>§prefix: Option<Prefix>

Optional pre-built, variable-length prefix written before each record.

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impl RecordEncoder

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fn prepare_for_batch<'a>( &'a self, batch: &'a RecordBatch, ) -> Result<Vec<FieldEncoder<'a>>, ArrowError>

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pub fn encode<W: Write>( &self, out: &mut W, batch: &RecordBatch, ) -> Result<(), ArrowError>

Encode a RecordBatch using this encoder plan.

Tip: Wrap out in a std::io::BufWriter to reduce the overhead of many small writes.

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impl Clone for RecordEncoder

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fn clone(&self) -> RecordEncoder

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for RecordEncoder

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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<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<T> Same for T

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type Output = T

Should always be Self
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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 = Infallible

The type returned in the event of a conversion error.
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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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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,