Struct tidb_query_datatype::codec::chunk::chunk::Chunk [−][src]
Chunk stores multiple rows of data.
Values are appended in compact format and can be directly accessed without decoding.
When the chunk is done processing, we can reuse the allocated memory by resetting it.
Fields
columns: Vec<Column>Implementations
impl Chunk[src]
pub fn from_columns(columns: Vec<Column>) -> Chunk[src]
Creates a new Chunk from Chunk columns.
pub fn new(field_types: &[FieldType], cap: usize) -> Chunk[src]
Create a new chunk with field types and capacity.
pub fn reset(&mut self)[src]
Reset the chunk, so the memory it allocated can be reused. Make sure all the data in the chunk is not used anymore before you reuse this chunk.
pub fn num_cols(&self) -> usize[src]
Get the number of rows in the chunk.
pub fn num_rows(&self) -> usize[src]
Get the number of rows in the chunk.
pub fn append_datum(&mut self, col_idx: usize, v: &Datum) -> Result<()>[src]
Append a datum to the column
pub fn get_row(&self, idx: usize) -> Option<Row<'_>>[src]
Get the Row in the chunk with the row index.
pub fn iter(&self) -> RowIterator<'_>ⓘNotable traits for RowIterator<'a>
impl<'a> Iterator for RowIterator<'a> type Item = Row<'a>;[src]
Notable traits for RowIterator<'a>
impl<'a> Iterator for RowIterator<'a> type Item = Row<'a>;Auto Trait Implementations
impl RefUnwindSafe for Chunk
impl Send for Chunk
impl Sync for Chunk
impl Unpin for Chunk
impl UnwindSafe for Chunk
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T[src]
impl<V, W> ConvertFrom<W> for V where
W: ConvertTo<V>, [src]
W: ConvertTo<V>,
pub fn convert_from(&mut EvalContext, W) -> Result<V, Error>[src]
impl<T> From<T> for T[src]
impl<T> Instrument for T[src]
pub fn instrument(self, span: Span) -> Instrumented<Self>[src]
pub fn in_current_span(self) -> Instrumented<Self>[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T> Pointable for T[src]
pub const ALIGN: usize[src]
type Init = T
The type for initializers.
pub unsafe fn init(init: <T as Pointable>::Init) -> usize[src]
pub unsafe fn deref<'a>(ptr: usize) -> &'a T[src]
pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T[src]
pub unsafe fn drop(ptr: usize)[src]
impl<T> Same<T> for T[src]
type Output = T
Should always be Self
impl<T> Sealed<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> SendSyncUnwindSafe for T where
T: Send + Sync + UnwindSafe + ?Sized, [src]
T: Send + Sync + UnwindSafe + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
impl<V, T> VZip<V> for T where
V: MultiLane<T>, [src]
V: MultiLane<T>,