Method cast_to_string

graphlite/src/exec/executor.rs:5016–5059

Cast value to STRING

(
        &self,
        value: Value,
        max_length: Option<usize>,
    )

    /// Cast value to STRING
    fn cast_to_string(
        &self,
        value: Value,
        max_length: Option<usize>,
    ) -> Result<Value, ExecutionError> {
        let string_value = match value {
            Value::String(s) => s,
            Value::Number(n) => {
                if n.fract() == 0.0 {
                    format!("{}", n as i64)
                } else {
                    format!("{}", n)
                }
            }
            Value::Boolean(b) => {
                if b {
                    "true".to_string()
                } else {
                    "false".to_string()
                }
            }
            Value::DateTime(dt) => dt.format("%Y-%m-%d %H:%M:%S UTC").to_string(),
            Value::Null => return Ok(Value::Null),
            _ => {
                return Err(ExecutionError::RuntimeError(format!(
                    "Cannot cast {:?} to STRING",
                    value.type_name()
                )))
            }
        };

        // Apply max_length constraint if specified
        let final_string = if let Some(max_len) = max_length {
            if string_value.len() > max_len {
                string_value[..max_len].to_string()
            } else {
                string_value
            }
        } else {
            string_value
        };

        Ok(Value::String(final_string))
    }

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