Function log2 

pub fn log2<'a, V, E>(
    expr: E,
) -> SQLExpr<'a, V, <V::DialectMarker as DialectTypes>::Double, <V::DialectMarker as Log2Policy>::Nullable, E::Aggregate>
where
    V: SQLParam + 'a,
    V::DialectMarker: MathExt + Log2Policy,
    E: Expr<'a, V>,
    E::SQLType: Numeric,

LOG2 - returns the base-2 logarithm of a number.

Available in SQLite when compiled with SQLITE_ENABLE_MATH_FUNCTIONS, and natively in MySQL. Returns a nullable dialect-aware double because invalid domains produce NULL in both dialects.

Example

use drizzle_core::expr::log2;

// SELECT LOG2(users.value)
let log_base_2 = log2(users.value);