Struct DerivedRef 

pub struct DerivedRef<'a> {
    pub nesting: usize,
    pub index: usize,
    pub derived: &'a TableDerived,
}

A resolved reference into a derived table column.

Fields

nesting: usize

How many query scopes up from the current scope.

index: usize

The column index within the derived table’s output.

derived: &'a TableDerived

Reference to the derived table definition.

Implementations

impl DerivedRef<'_>

pub fn is_column_always_null(&self) -> bool

Returns true if the derived table is backed by a VALUES body and every row has Null at this column position.

Returns false conservatively when the body is not VALUES, the VALUES is empty, or any row doesn’t have a recognizable null at the column.

Trait Implementations

impl<'a> Debug for DerivedRef<'a>

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

Formats the value using the given formatter.