Struct Field 

pub struct Field {
    pub column: Column,
    pub of: Option<Arc<str>>,
}

One column of the rows a query produced, and the table name a reference may qualify it with.

A Column is what goes on the wire; this is what a where, an order by and a select list resolve a name against. The two are separate because a joined row has columns from several tables and two of them may share a name — which is a question about the query rather than about the wire, where a column is a name and a type OID and nothing else.

Fields

column: Column

of: Option<Arc<str>>

The table this came from, as this query knows it. None for a computed column — an aggregate, a literal, or anything given an alias, none of which a qualified name may reach.

Implementations

impl Field

pub fn of_table(t: &Table) -> Vec<Field>

A base table’s own columns, which is what a query over one table resolves against.

pub fn of_table_as(t: &Table, alias: Arc<str>) -> Vec<Field>

The same, under the name the query calls the table.

A qualified reference names the alias — from pg_attribute a … where a.attnum > 0 — so a query over one table has to resolve names against the alias exactly as a join does. One rule, in both places, because a name that resolved one way in a scan and another in a join would be two.

Trait Implementations

impl Clone for Field

fn clone(&self) -> Field

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Field

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

Formats the value using the given formatter.