Struct TableFunction 

pub struct TableFunction { /* private fields */ }

A Function committed to the from-item form: the call plus gram.y’s func_alias_clause, [ AS ] [ alias ] ( column_definition [, ...] ).

Function::as_table and Function::columns return this instead of Function, and the expression-position enders — Function::as_, Function::over, Function::over_name — do not exist here. That is the point: func_alias_clause has exactly one AS shared between the alias and the column definitions, so f() AS ("a" int) AS "r" — the column form plus the select-list alias — is a syntax error, and this type makes it unwritable rather than an error to render. The from-item alias is the as_table alias.

from_functions accepts a plain Function and a TableFunction alike, so f(..) and f(..).columns(..) both go straight in.

Implementations

impl TableFunction

pub fn as_table(self, alias: impl Into<Cow<'static, str>>) -> TableFunction

The alias in front of the column definitions: f() AS "t" ("a" int).

pub fn columns<N, T>( self, columns: impl IntoIterator<Item = (N, T)>, ) -> TableFunction

where N: Into<Cow<'static, str>>, T: Into<Cow<'static, str>>,

Add column definitions. Several calls accumulate into the one list.

Trait Implementations

impl Clone for TableFunction

fn clone(&self) -> TableFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TableFunction

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

Formats the value using the given formatter.

impl Expression for TableFunction

fn write_sql(&self, w: &mut SqlWriter<'_>)

Append this fragment to w.

impl From<Function> for TableFunction

fn from(function: Function) -> TableFunction

Converts to this type from the input type.

impl IntoExpr for TableFunction

fn into_expr(self) -> Expr

Perform the conversion.

impl IntoExprList for TableFunction

fn into_expr_list(self) -> Vec<Expr>

Perform the conversion.