Struct tidb_query_expr::types::function::ScalarArg

pub struct ScalarArg<'a, T: EvaluableRef<'a>>(Option<T>, PhantomData<&'a T>);

Represents an RPN function argument of a ScalarValue.

Implementations

impl<'a, T: EvaluableRef<'a>> ScalarArg<'a, T>

pub fn new(data: Option<T>) -> Self

Trait Implementations

impl<'a, T: Clone + EvaluableRef<'a>> Clone for ScalarArg<'a, T>

fn clone(&self) -> ScalarArg<'a, T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a, T: Copy + EvaluableRef<'a>> Copy for ScalarArg<'a, T>

impl<'a, T: Debug + EvaluableRef<'a>> Debug for ScalarArg<'a, T>

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

Formats the value using the given formatter.

impl<'a, T: EvaluableRef<'a>> RpnFnArg for ScalarArg<'a, T>

type Type = Option<T>

fn get(&self, _row: usize) -> Option<T>

Gets the value in the given row. All rows of a ScalarArg share the same value.

fn get_bit_vec(&self) -> (Option<&BitVec>, bool)

Gets the bit vector of the arg. Returns None if scalar value, and bool indicates whether all is null or isn’t null, otherwise a BitVec. Returns Some if vector value, and bool indicates whether stored bitmap vector has the same layout as elements, aka. logical_rows is identical or not. If logical_rows is identical, the second tuple element yields true.