datafusion_functions_aggregate::stddev

Struct StddevGroupsAccumulator

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pub struct StddevGroupsAccumulator { /* private fields */ }

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impl Debug for StddevGroupsAccumulator

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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 GroupsAccumulator for StddevGroupsAccumulator

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fn update_batch( &mut self, values: &[ArrayRef], group_indices: &[usize], opt_filter: Option<&BooleanArray>, total_num_groups: usize, ) -> Result<()>

Updates the accumulator’s state from its arguments, encoded as a vector of ArrayRefs. Read more
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fn merge_batch( &mut self, values: &[ArrayRef], group_indices: &[usize], opt_filter: Option<&BooleanArray>, total_num_groups: usize, ) -> Result<()>

Merges intermediate state (the output from Self::state) into this accumulator’s current state. Read more
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fn evaluate(&mut self, emit_to: EmitTo) -> Result<ArrayRef>

Returns the final aggregate value for each group as a single RecordBatch, resetting the internal state. Read more
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fn state(&mut self, emit_to: EmitTo) -> Result<Vec<ArrayRef>>

Returns the intermediate aggregate state for this accumulator, used for multi-phase grouping, resetting its internal state. Read more
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fn size(&self) -> usize

Amount of memory used to store the state of this accumulator, in bytes. Read more
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fn convert_to_state( &self, _values: &[Arc<dyn Array>], _opt_filter: Option<&BooleanArray>, ) -> Result<Vec<Arc<dyn Array>>, DataFusionError>

Converts an input batch directly to the intermediate aggregate state. Read more
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fn supports_convert_to_state(&self) -> bool

Returns true if Self::convert_to_state is implemented to support intermediate aggregate state conversion.

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impl<T> Any for T
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fn into(self) -> U

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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where F: FnOnce(&Self) -> bool,

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type Error = Infallible

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

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