Struct FromJoin 

pub struct FromJoin {
    pub kind: JoinKind,
    pub table: TableRef,
    pub on: Option<Expr>,
    pub using_cols: Option<Vec<String>>,
    pub natural: bool,
}

Fields

kind: JoinKind

table: TableRef

on: Option<Expr>

Required for INNER/LEFT; must be None for CROSS / comma-list.

using_cols: Option<Vec<String>>

v7.37.16 — JOIN … USING (c1, c2, …). When Some, records the USING column list so the executor can perform PG’s column-merge (the join columns collapse to a single unqualified output column, t1.c for INNER/LEFT, t2.c for RIGHT, COALESCE(t1.c,t2.c) for FULL, and appear first in SELECT *). The parser ALSO desugars USING into an equivalent on predicate so the join filter/count path works unchanged; using_cols drives only the output-shape rewrite. Empty/None for ON and CROSS joins.

natural: bool

v7.37.16 — NATURAL [INNER|LEFT|RIGHT|FULL] JOIN. The common column names are not known until the table schemas are available (parse time is schema-less), so the parser only sets this flag and leaves on/using_cols empty; the engine resolves the common columns at execution time, synthesises the on predicate + the USING column-merge, and clears the flag. If there are no common columns PG treats it as a CROSS join.

Trait Implementations

impl Clone for FromJoin

fn clone(&self) -> FromJoin

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FromJoin

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

Formats the value using the given formatter.

impl PartialEq for FromJoin

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FromJoin