Struct From 

pub struct From {
    pub namespace: Option<String>,
    pub table: String,
    pub alias: String,
    pub on: Vec<(Name, Name)>,
    pub left: bool,
    pub function: Option<String>,
}

One entry of the from list: a table, what this query calls it, and what joins it.

Fields

namespace: Option<String>

The schema qualifying the table’s name, if it was written: pg_catalog.pg_class.

table: String

The table’s name in the schema.

alias: String

The name a qualified column reference uses — the alias, or the table’s own name.

on: Vec<(Name, Name)>

The on equalities, as (this table’s column, an earlier table’s column). Empty for the first entry, which nothing joins to, and for a comma join, whose equality is in the where.

left: bool

left join: a row of the table before this one survives with nulls where this one has no match. The catalogue is full of them — pg_class left join pg_am is how psql asks for a table’s access method without losing the tables that have none.

function: Option<String>

A from item that is a function call rather than a relation. Parsed so that a query carrying one in a branch nothing evaluates is not refused for it, and refused by name if anything asks it for a row.

Trait Implementations

impl Clone for From

fn clone(&self) -> From

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for From

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

Formats the value using the given formatter.