Struct UpdateStatement 

pub struct UpdateStatement {
    pub ctes: Vec<Cte>,
    pub table: String,
    pub only: bool,
    pub alias: Option<String>,
    pub assignments: Vec<(String, Expr)>,
    pub from_sources: Option<Box<UpdateFromSources>>,
    pub where_: Option<Expr>,
    pub order_limit: Option<Box<DmlOrderLimit>>,
    pub returning: Option<Vec<SelectItem>>,
}

Fields

ctes: Vec<Cte>

v7.37.43-T4.4 — leading WITH cte AS (…) clauses on a top- level UPDATE. Empty for a plain UPDATE.

table: String

only: bool

v7.39 (round 646) — UPDATE ONLY t / DELETE FROM ONLY t: apply to t’s own rows and not to anything that descends from it.

Round 644 taught the FROM clause the keyword and left DML behind because it needed a field here, and this struct carries a warning that round 413 measured widening it in place overflowing the parser’s nesting stack. That warning was about from_sources, a struct wide enough to need boxing; a bool lands in the padding already present — same as CreateTableStatement::temporary.

It also earns its keep beyond the spelling: the inheritance fan-out needs a way to say “the parent’s own rows” as a statement, or running one on the parent recurses forever.

alias: Option<String>

v7.39 (round 241) — UPDATE t [AS] alias SET …: the name the statement’s expressions refer to the target row by. PG allows the bare spelling here (unlike INSERT, which requires AS).

assignments: Vec<(String, Expr)>

from_sources: Option<Box<UpdateFromSources>>

v7.39 (round 533) — boxed: round 413 measured that widening this struct in place overflows the parser’s nesting stack.

where_: Option<Expr>

order_limit: Option<Box<DmlOrderLimit>>

v7.39 (round 413) — MySQL’s UPDATE … [ORDER BY … [LIMIT n]]: mutate the first limit rows in the given order. PG has no such clause; the parser accepts it only under the MySQL dialect. Boxed so a PG UPDATE (the common case) grows this struct by ONE pointer, not Vec<OrderBy> + Option<u32> — a naked add tipped the parser’s 512 KiB nesting stack under a full workspace test (round 305 kin).

returning: Option<Vec<SelectItem>>

v7.9.4 — RETURNING <projection>. None = no RETURNING clause (legacy CommandComplete path). Some = engine evaluates the projection over each mutated row and streams the result as a Rows QueryResult.

Trait Implementations

impl Clone for UpdateStatement

fn clone(&self) -> UpdateStatement

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UpdateStatement

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

Formats the value using the given formatter.

impl Display for UpdateStatement

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

Formats the value using the given formatter.

impl PartialEq for UpdateStatement

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for UpdateStatement