Struct Flatten 

#[non_exhaustive]
pub struct Flatten {
    pub from_item: String,
    pub ordinal: String,
    pub fields: Vec<String>,
}

How this engine spells the fan-out.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

from_item: String

The FROM item producing one row per element, written to follow the source relation and its alias. An engine that needs two table functions applied in series returns both here, as one piece of text.

Razeri writes FROM <source_relation> AS <source_alias> and then this, so an implementation begins with whatever its engine puts between the two — a comma for a lateral join in the FROM list, nothing at all for an engine whose fan-out is a clause of its own.

ordinal: String

Reads the element’s position. One for the first element, whatever the engine counts from.

fields: Vec<String>

One expression per requested field, in the order asked. An array of scalars is answered with exactly one expression, reading the element whole.

Implementations

impl Flatten

pub fn new( from_item: impl Into<String>, ordinal: impl Into<String>, fields: Vec<String>, ) -> Self

State a fan-out: the FROM item, the one-based ordinal, and one expression per field asked for.

Trait Implementations

impl Clone for Flatten

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 Flatten

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

Formats the value using the given formatter.

impl Eq for Flatten

impl PartialEq for Flatten

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Flatten