Method cast_value

graphlite/src/exec/executor.rs:4968–4992

Cast a value to a target type

(
        &self,
        value: Value,
        target_type: &crate::ast::TypeSpec,
    )

    /// Cast a value to a target type
    fn cast_value(
        &self,
        value: Value,
        target_type: &crate::ast::TypeSpec,
    ) -> Result<Value, ExecutionError> {
        use crate::ast::TypeSpec;

        match target_type {
            TypeSpec::Boolean => self.cast_to_boolean(value),
            TypeSpec::String { max_length } => self.cast_to_string(value, *max_length),
            TypeSpec::Integer => self.cast_to_integer(value),
            TypeSpec::BigInt => self.cast_to_bigint(value),
            TypeSpec::SmallInt => self.cast_to_smallint(value),
            TypeSpec::Float { .. } => self.cast_to_float(value),
            TypeSpec::Real => self.cast_to_real(value),
            TypeSpec::Double => self.cast_to_double(value),
            TypeSpec::Decimal { precision, scale } => {
                self.cast_to_decimal(value, *precision, *scale)
            }
            _ => Err(ExecutionError::RuntimeError(format!(
                "CAST to {:?} is not yet implemented",
                target_type
            ))),
        }
    }

    /// Cast value to BOOLEAN
    fn cast_to_boolean(&self, value: Value) -> Result<Value, ExecutionError> {