Function execute_single_statement 

pub fn execute_single_statement<'a>(
    session: &'a mut CqlSession,
    config: &'a MergedConfig,
    colorizer: &'a CqlColorizer,
    debug: &'a mut bool,
    input: &'a str,
    source_name: Option<&'a str>,
    line_number: usize,
    writer: &'a mut dyn Write,
) -> Pin<Box<dyn Future<Output = bool> + 'a>>

Execute a single CQL statement or shell command in non-interactive mode.

Output is written to writer; errors and warnings are written to stderr. debug is mutable so that DEBUG ON/OFF affects subsequent statements.

Returns true on success, false on error.