Enum Expression

pub enum Expression<'a> {
    Binary {
        op: BinaryOperator,
        op_span: Span,
        lhs: Box<Expression<'a>>,
        rhs: Box<Expression<'a>>,
    },
    Unary {
        op: UnaryOperator,
        op_span: Span,
        operand: Box<Expression<'a>>,
    },
    Subquery(Box<Statement<'a>>),
    Null(Span),
    Bool(bool, Span),
    String(SString<'a>),
    Integer((u64, Span)),
    ListHack((usize, Span)),
    Float((f64, Span)),
    Function(Function<'a>, Vec<Expression<'a>>, Span),
    WindowFunction {
        function: Function<'a>,
        args: Vec<Expression<'a>>,
        function_span: Span,
        over_span: Span,
        window_spec: WindowSpec<'a>,
    },
    Identifier(Vec<IdentifierPart<'a>>),
    Arg((usize, Span)),
    Exists(Box<Statement<'a>>),
    In {
        lhs: Box<Expression<'a>>,
        rhs: Vec<Expression<'a>>,
        in_span: Span,
        not_in: bool,
    },
    Is(Box<Expression<'a>>, Is, Span),
    Invalid(Span),
    Case {
        case_span: Span,
        value: Option<Box<Expression<'a>>>,
        whens: Vec<When<'a>>,
        else_: Option<(Span, Box<Expression<'a>>)>,
        end_span: Span,
    },
    Cast {
        cast_span: Span,
        expr: Box<Expression<'a>>,
        as_span: Span,
        type_: DataType<'a>,
    },
    Count {
        count_span: Span,
        distinct_span: Option<Span>,
        expr: Box<Expression<'a>>,
    },
    GroupConcat {
        group_concat_span: Span,
        distinct_span: Option<Span>,
        expr: Box<Expression<'a>>,
    },
    Variable {
        global: Option<Span>,
        session: Option<Span>,
        dot: Option<Span>,
        variable: Variable<'a>,
        variable_span: Span,
    },
}

Representation of an expression

Variants

Binary

Expression with binary operator

Fields

op: BinaryOperator

The operator to apply

op_span: Span

The span of the operator

lhs: Box<Expression<'a>>

Expression on the left hand side

rhs: Box<Expression<'a>>

Expression on the right hand side

Unary

Expression with a unary (prefix) operator

Fields

op: UnaryOperator

The operator to apply

op_span: Span

The span of the operator

operand: Box<Expression<'a>>

The expression on the right hand side

Subquery(Box<Statement<'a>>)

Subquery expression

Null(Span)

Literal NULL expression

Bool(bool, Span)

Literal bool expression “TRUE” or “FALSE”

String(SString<'a>)

Literal string expression, the SString contains the represented string with escaping removed

Integer((u64, Span))

Literal integer expression

ListHack((usize, Span))

Literal LIST

Float((f64, Span))

Literal floating point expression

Function(Function<'a>, Vec<Expression<'a>>, Span)

Function call expression,

WindowFunction

A window function call expression

Fields

function: Function<'a>

args: Vec<Expression<'a>>

function_span: Span

over_span: Span

window_spec: WindowSpec<'a>

Identifier(Vec<IdentifierPart<'a>>)

Identifier pointing to column

Arg((usize, Span))

Input argument to query, the first argument is the occurrence number of the argumnet

Exists(Box<Statement<'a>>)

Exists expression

In

In expression

Fields

lhs: Box<Expression<'a>>

Left hand side expression

rhs: Vec<Expression<'a>>

Right hand side expression

in_span: Span

Span of “IN” or “NOT IN”

not_in: bool

True if not in

Is(Box<Expression<'a>>, Is, Span)

Is expression

Invalid(Span)

Invalid expression, returned on recovery of a parse error

Case

Case expression

Fields

case_span: Span

Span of “CASE”

value: Option<Box<Expression<'a>>>

Optional value to switch over

whens: Vec<When<'a>>

When parts

else_: Option<(Span, Box<Expression<'a>>)>

Span of “ELSE” and else value if specified

end_span: Span

Span of “END”

Cast

Cast expression

Fields

cast_span: Span

Span of “CAST”

expr: Box<Expression<'a>>

Value to cast

as_span: Span

Span of “AS”

type_: DataType<'a>

Type to cast to

Count

Count expression

Fields

count_span: Span

Span of “COUNT”

distinct_span: Option<Span>

Span of “DISTINCT” if specified

expr: Box<Expression<'a>>

Expression to count

GroupConcat

Group contat expression

Fields

group_concat_span: Span

Span of “GROUP_CONCAT”

distinct_span: Option<Span>

Span of “DISTINCT” if specified

expr: Box<Expression<'a>>

Expression to count

Variable

Variable expression

Fields

global: Option<Span>

Span of “@@GLOBAL”

session: Option<Span>

Span of “@@SESSION”

dot: Option<Span>

Span of ‘.’

variable: Variable<'a>

variable

variable_span: Span

Trait Implementations

impl<'a> Clone for Expression<'a>

fn clone(&self) -> Expression<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Expression<'a>

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

Formats the value using the given formatter.

impl<'a> Spanned for Expression<'a>

fn span(&self) -> Span

Compute byte span of an ast fragment

fn join_span(&self, other: &impl OptSpanned) -> Span

Compute the minimal span containing both self and other