Enum JsonTableColumn 

pub enum JsonTableColumn<X: Extension = NoExt> {
    ForOrdinality {
        name: Ident,
        meta: Meta,
    },
    Regular {
        name: Ident,
        data_type: Box<DataType<X>>,
        format: Option<JsonFormat>,
        path: Option<Box<Expr<X>>>,
        wrapper: JsonWrapperBehavior,
        quotes: JsonQuotesBehavior,
        on_empty: Option<JsonBehavior<X>>,
        on_error: Option<JsonBehavior<X>>,
        meta: Meta,
    },
    Exists {
        name: Ident,
        data_type: Box<DataType<X>>,
        path: Option<Box<Expr<X>>>,
        on_error: Option<JsonBehavior<X>>,
        meta: Meta,
    },
    Nested {
        path: Box<Expr<X>>,
        path_name: Option<Ident>,
        columns: ThinVec<JsonTableColumn<X>>,
        meta: Meta,
    },
}

One column of a JsonTable COLUMNS specification (PostgreSQL’s JsonTableColumn, tagged by coltype).

The wrapper/quotes/behaviour clauses reuse the SQL/JSON expression-function nodes. The per-kind clause legality is enforced at parse (matching PostgreSQL): only a Regular column takes FORMAT/wrapper/quotes/ON EMPTY; Exists takes only ON ERROR; Nested takes no behaviours and recurses through its own COLUMNS.

Variants

ForOrdinality

<name> FOR ORDINALITY — a 1-based row-sequence column; no type, no other clauses.

Fields

name: Ident

Name referenced by this syntax.

meta: Meta

Source location and node identity.

Regular

<name> <type> [FORMAT JSON …] [PATH <string>] [wrapper] [quotes] [<b> ON EMPTY] [<b> ON ERROR] — a value column projecting the JSON at its path.

Fields

name: Ident

Name referenced by this syntax.

data_type: Box<DataType<X>>

Data type named by this syntax.

format: Option<JsonFormat>

Optional format for this syntax.

path: Option<Box<Expr<X>>>

PATH <string> — a string literal; None uses the implicit $.<name> path.

wrapper: JsonWrapperBehavior

The WITH/WITHOUT WRAPPER behaviour; see JsonWrapperBehavior.

quotes: JsonQuotesBehavior

The KEEP/OMIT QUOTES behaviour; see JsonQuotesBehavior.

on_empty: Option<JsonBehavior<X>>

Optional on empty for this syntax.

on_error: Option<JsonBehavior<X>>

Optional on error for this syntax.

meta: Meta

Source location and node identity.

Exists

<name> <type> EXISTS [PATH <string>] [<b> ON ERROR] — a boolean-ish column testing whether the path matches; takes neither FORMAT/wrapper/quotes nor ON EMPTY.

Fields

name: Ident

Name referenced by this syntax.

data_type: Box<DataType<X>>

Data type named by this syntax.

path: Option<Box<Expr<X>>>

Optional path for this syntax.

on_error: Option<JsonBehavior<X>>

Optional on error for this syntax.

meta: Meta

Source location and node identity.

Nested

NESTED [PATH] <string> [AS <name>] COLUMNS ( … ) — a sub-table joined against a nested path, recursing through its own column list (PostgreSQL requires the nested COLUMNS to be present and non-empty).

Fields

path: Box<Expr<X>>

The nested JSON path (a string literal).

path_name: Option<Ident>

Optional path name for this syntax.

columns: ThinVec<JsonTableColumn<X>>

Columns in source order.

meta: Meta

Source location and node identity.

Trait Implementations

impl<X: Clone + Extension> Clone for JsonTableColumn<X>

fn clone(&self) -> JsonTableColumn<X>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<X: Debug + Extension> Debug for JsonTableColumn<X>

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

Formats the value using the given formatter.

impl<'de, X> Deserialize<'de> for JsonTableColumn<X>

where X: Deserialize<'de> + Extension,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<X: Eq + Extension> Eq for JsonTableColumn<X>

impl<X: Hash + Extension> Hash for JsonTableColumn<X>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<X: PartialEq + Extension> PartialEq for JsonTableColumn<X>

fn eq(&self, other: &JsonTableColumn<X>) -> bool

Equality operator ==.

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

Inequality operator !=.

impl<X: Extension + Render> Render for JsonTableColumn<X>

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

Return the render for this value.

fn operand_binding_power(&self) -> Option<BindingPower>

The binding power this node contributes when it appears as an operand, or None (the default) for a self-delimiting node — an atom, call, or constructor — that never needs parentheses.

impl<X> Serialize for JsonTableColumn<X>

where X: Serialize + Extension,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<X: Extension> Spanned for JsonTableColumn<X>

fn span(&self) -> Span

Return the span for this value.

impl<X: PartialEq + Extension> StructuralPartialEq for JsonTableColumn<X>