Struct datafusion::config::AggregateOptions
source · pub struct AggregateOptions {
pub scalar_update_factor: usize,
}
Expand description
Options related to aggregate execution
Fields (Non-exhaustive)§
This struct is marked as non-exhaustive
Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional
Struct { .. }
syntax; cannot be matched against without a wildcard ..
; and struct update syntax will not work.scalar_update_factor: usize
Specifies the threshold for using ScalarValue
s to update
accumulators during high-cardinality aggregations for each input batch.
The aggregation is considered high-cardinality if the number of affected groups
is greater than or equal to batch_size / scalar_update_factor
. In such cases,
ScalarValue
s are utilized for updating accumulators, rather than the default
batch-slice approach. This can lead to performance improvements.
By adjusting the scalar_update_factor
, you can balance the trade-off between
more efficient accumulator updates and the number of groups affected.
Trait Implementations§
source§impl Clone for AggregateOptions
impl Clone for AggregateOptions
source§fn clone(&self) -> AggregateOptions
fn clone(&self) -> AggregateOptions
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for AggregateOptions
impl Debug for AggregateOptions
source§impl Default for AggregateOptions
impl Default for AggregateOptions
source§fn default() -> AggregateOptions
fn default() -> AggregateOptions
Returns the “default value” for a type. Read more
Auto Trait Implementations§
impl RefUnwindSafe for AggregateOptions
impl Send for AggregateOptions
impl Sync for AggregateOptions
impl Unpin for AggregateOptions
impl UnwindSafe for AggregateOptions
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more