Struct MergeStatement 

pub struct MergeStatement {
    pub ctes: Vec<Cte>,
    pub target: String,
    pub target_alias: Option<String>,
    pub source: String,
    pub source_alias: Option<String>,
    pub source_select: Option<Box<SelectStatement>>,
    pub source_column_aliases: Vec<String>,
    pub on: Expr,
    pub clauses: Vec<MergeWhenClause>,
    pub returning: Option<Vec<SelectItem>>,
}

v7.17.0 Phase 3.P0-42 — SQL:2003 / PG 15+ MERGE statement. One WHEN clause fires per source row depending on whether the on condition matched any target row(s); the executor walks clauses in declaration order and fires the first whose matched kind and optional condition are both satisfied.

Fields

ctes: Vec<Cte>

v7.39 (read01 round 149) — leading WITH <cte> [, …] (PG 15 allows a WITH clause on MERGE; WITH RECURSIVE is rejected at parse, as in PG). Each CTE materialises before the merge runs and its alias resolves as a source relation.

target: String

target_alias: Option<String>

source: String

source_alias: Option<String>

source_select: Option<Box<SelectStatement>>

v7.37 D.44 — USING (SELECT …) alias subquery source. When present, the engine materialises this SELECT for the source rows and source is empty; the alias (required by PG for a subquery source) is in source_alias. None = plain USING <table> (source names a table).

source_column_aliases: Vec<String>

v7.39 (round 768, F31-D5) — USING (VALUES …) s(id, v): the positional column-alias list after the source alias. Empty when the statement carries none; the engine renames the materialised source columns positionally (PG’s rule).

on: Expr

clauses: Vec<MergeWhenClause>

returning: Option<Vec<SelectItem>>

v7.39 (read01 round 130) — PG17+ MERGE … RETURNING <projection>. The projection may use merge_action(), OLD.*/NEW.*, and the target/source aliases. None = no RETURNING (the common form).

Trait Implementations

impl Clone for MergeStatement

fn clone(&self) -> MergeStatement

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MergeStatement

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

Formats the value using the given formatter.

impl Display for MergeStatement

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

Formats the value using the given formatter.

impl PartialEq for MergeStatement

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MergeStatement