Struct Features 

pub struct Features(/* private fields */);

Metadata about what features are supported by the Server to which this Client connects.

Implementations

impl Features

pub fn get_group_rollup_modes(&self) -> Vec<GroupRollupMode>

pub fn get_split_rollup_modes(&self) -> Vec<SplitRollupMode>

Unlike Features::get_group_rollup_modes, an empty feature list resolves to [Flat] rather than “no constraint” - servers predating (or not implementing) split rollup can only produce leaf columns, so absence must not offer the Rollup option.

Methods from Deref<Target = GetFeaturesResp>

pub fn default_op(&self, col_type: ColumnType) -> Option<&str>

pub fn get_window_aggregates( &self, col_type: ColumnType, ) -> Vec<WindowAggregateArgs>

The window aggregates this server supports for a col_type SOURCE column, in the server’s declared (menu) order.

pub fn has_window_aggregates(&self) -> bool

Whether this server supports window columns at all - the window_aggregates declaration is the single source of truth.

pub fn group_rollup_mode( &self, ) -> FilterMap<Cloned<Iter<'_, i32>>, fn(i32) -> Option<GroupRollupMode>>

Returns an iterator which yields the valid enum values contained in group_rollup_mode.

pub fn split_rollup_mode( &self, ) -> FilterMap<Cloned<Iter<'_, i32>>, fn(i32) -> Option<SplitRollupMode>>

Returns an iterator which yields the valid enum values contained in split_rollup_mode.

Trait Implementations

impl Clone for Features

fn clone(&self) -> Features

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Features

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

Formats the value using the given formatter.

impl Default for Features

fn default() -> Features

Returns the “default value” for a type.

impl Deref for Features

type Target = GetFeaturesResp

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl PartialEq for Features

fn eq(&self, other: &Features) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Features