Enum FromItemKind 

pub enum FromItemKind {
    Relation,
    Unnest,
    GenerateSeries,
    Subquery,
    JsonbEach,
    TableFn,
    RowsFrom,
    JsonTable,
    ScalarFn,
}

What a FROM item IS.

v7.40.10 — a boolean cannot make a consumer handle a new kind; an enum can. Every consumer that must know the difference writes a match with no wildcard arm, so a variant added here is a compile error at each of them rather than a defect at whichever one the new shape reaches first.

The engine asked “is this item synthesised?” in fifty-six places and exactly one of them listed every field. The rest were missing between one and five, and the gaps were reachable: SELECT * FROM jsonb_each_text('{"a":1}'::jsonb) answered relation "jsonb_each_text" does not exist over the extended protocol because one such list named four of seven.

Variants

Relation

A table, view or CTE named in the catalog.

Unnest

unnest(...) and the set-returning functions the parser lowers onto the same slot (string_to_table, jsonb_object_keys, …).

GenerateSeries

generate_series(...).

Subquery

A derived table or LATERAL subquery.

JsonbEach

jsonb_each(...) / jsonb_each_text(...).

TableFn

A table function call the parser kept as a name plus arguments.

RowsFrom

ROWS FROM (...).

JsonTable

JSON_TABLE(...).

ScalarFn

A scalar function in FROM position, which yields one row.

Trait Implementations

impl Clone for FromItemKind

fn clone(&self) -> FromItemKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FromItemKind

impl Debug for FromItemKind

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

Formats the value using the given formatter.

impl Eq for FromItemKind

impl PartialEq for FromItemKind

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FromItemKind