Struct MinMaxBytesAccumulator 

pub(crate) struct MinMaxBytesAccumulator {
    inner: MinMaxBytesState,
    is_min: bool,
}

Implements fast Min/Max [GroupsAccumulator] for “bytes” types (StringArray, BinaryArray, StringViewArray, etc)

This implementation dispatches to the appropriate specialized code in MinMaxBytesState based on data type and comparison function

Fields

inner: MinMaxBytesState

Inner data storage.

is_min: bool

if true, is MIN otherwise is MAX

Implementations

impl MinMaxBytesAccumulator

pub fn new_min(data_type: DataType) -> Self

Create a new accumulator for computing min(val)

pub fn new_max(data_type: DataType) -> Self

Create a new accumulator fo computing max(val)

Trait Implementations

impl Debug for MinMaxBytesAccumulator

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl GroupsAccumulator for MinMaxBytesAccumulator

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 [ArrayRef]s.

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.

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.

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.

fn convert_to_state( &self, values: &[ArrayRef], opt_filter: Option<&BooleanArray>, ) -> Result<Vec<ArrayRef>>

Converts an input batch directly to the intermediate aggregate state.

fn supports_convert_to_state(&self) -> bool

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

fn size(&self) -> usize

Amount of memory used to store the state of this accumulator, in bytes.