Struct mz_sql::plan::plan_utils::GroupSizeHints

pub struct GroupSizeHints {
    pub aggregate_input_group_size: Option<u64>,
    pub distinct_on_input_group_size: Option<u64>,
    pub limit_input_group_size: Option<u64>,
}

Specifies a bundle of group size query hints.

This struct bridges from old to new syntax for group size query hints, making it easier to pass these hints along and make use of a group size hint configuration.

Fields

aggregate_input_group_size: Option<u64>

distinct_on_input_group_size: Option<u64>

limit_input_group_size: Option<u64>

Trait Implementations

impl Clone for GroupSizeHints

fn clone(&self) -> GroupSizeHints

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GroupSizeHints

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

Formats the value using the given formatter.

impl Default for GroupSizeHints

fn default() -> GroupSizeHints

Returns the “default value” for a type.

impl TryFrom<SelectOptionExtracted> for GroupSizeHints

fn try_from( select_option_extracted: SelectOptionExtracted, ) -> Result<Self, Self::Error>

Creates group size hints from extracted SELECT OPTIONS validating that either the old EXPECTED GROUP SIZE syntax was used or alternatively the new syntax with AGGREGATE INPUT GROUP SIZE, DISTINCT ON INPUT GROUP SIZE, and LIMIT INPUT GROUP SIZE. If the two syntax versions are mixed in the same OPTIONS clause, an error is returned.[^1] [^1] https://github.com/MaterializeInc/materialize/blob/main/doc/developer/design/20230829_topk_size_hint.md

type Error = PlanError

The type returned in the event of a conversion error.

impl Copy for GroupSizeHints