Enum IrPathJoin 

pub enum IrPathJoin {
    Single {
        source_alias: String,
        fk_col: String,
        target: IrSource,
    },
    Multi {
        source_alias: String,
        junction_alias: String,
        join: IrMultiLinkJoin,
        target: IrSource,
    },
    BacklinkSingle {
        source_alias: String,
        fk_col: String,
        target: IrSource,
    },
    Function {
        fn_module: String,
        fn_name: String,
        args: Vec<IrExpr>,
        target: IrSource,
    },
    Lateral {
        inner: Box<IrPathSelect>,
        target: IrSource,
    },
    BacklinkMulti {
        source_alias: String,
        junction_alias: String,
        junction_table: String,
        module: String,
        owner_col: String,
        current_col: String,
        target: IrSource,
    },
}

Variants

Single

Traverse a single (FK) link.

Fields

source_alias: String

fk_col: String

target: IrSource

Multi

Traverse a multi-link via a junction table.

Fields

source_alias: String

junction_alias: String

join: IrMultiLinkJoin

target: IrSource

BacklinkSingle

Reverse of a single FK link: find owner rows whose FK column points to the current row.

Fields

source_alias: String

fk_col: String

target: IrSource

Function

An object-returning user function as the next row source — translation := latest(.id) traversed as .translation.value. Emitted as a CROSS JOIN LATERAL, since args reference the alias the traversal has reached so far.

Fields

fn_module: String

fn_name: String

args: Vec<IrExpr>

target: IrSource

Lateral

A computed pointer that carries its own FILTER/ORDER BY/LIMIT as the next row source — .translation.name, where translation is select .translations filter … order by … limit 1. Those modifiers apply per source row, which a plain join cannot express, so the computed’s own traversal becomes a correlated JOIN LATERAL.

Fields

inner: Box<IrPathSelect>

target: IrSource

BacklinkMulti

Reverse of a multi-link: traverse the junction table in reverse.

Fields

source_alias: String

junction_alias: String

junction_table: String

module: String

owner_col: String

Junction column that points to the owner (forward source).

current_col: String

Junction column that points to the current row (forward target).

target: IrSource

Trait Implementations

impl Clone for IrPathJoin

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IrPathJoin

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

Formats the value using the given formatter.