Struct fang::blocking::schema::fang_tasks::columns::star

pub struct star;

Represents table_name.*, which is sometimes needed for efficient count queries. It cannot be used in place of all_columns, and has a SqlType of () to prevent it being used that way

Trait Implementations

impl Clone for star

fn clone(&self) -> star

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for star

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

Formats the value using the given formatter.

impl Expression for star

type SqlType = NotSelectable

The type that this expression represents in SQL

impl<DB: Backend> QueryFragment<DB, NotSpecialized> for starwhere <table as QuerySource>::FromClause: QueryFragment<DB>,

fn walk_ast<'b>( &'b self, __diesel_internal_out: AstPass<'_, 'b, DB> ) -> QueryResult<()>

Walk over this QueryFragment for all passes.

impl QueryId for star

type QueryId = star

A type which uniquely represents Self in a SQL query.

const HAS_STATIC_QUERY_ID: bool = true

Can the SQL generated by Self be uniquely identified by its type?

fn query_id() -> Option<TypeId>

Returns the type id of Self::QueryId if Self::HAS_STATIC_QUERY_ID. Returns None otherwise.

impl<__GB> ValidGrouping<__GB> for starwhere (id, metadata, error_message, state, task_type, uniq_hash, retries, scheduled_at, created_at, updated_at): ValidGrouping<__GB>,

type IsAggregate = <(id, metadata, error_message, state, task_type, uniq_hash, retries, scheduled_at, created_at, updated_at) as ValidGrouping<__GB>>::IsAggregate

Is this expression aggregate?

impl AppearsOnTable<table> for star

impl Copy for star

impl SelectableExpression<table> for star