Function extract_string_literal_arg

nodedb-sql/src/resolver/columns.rs:318–335

(arg: &sqlparser::ast::FunctionArg)

}

fn extract_string_literal_arg(arg: &sqlparser::ast::FunctionArg) -> Option<String> {
    use sqlparser::ast::{Expr, FunctionArg, FunctionArgExpr, Value};
    let expr = match arg {
        FunctionArg::Unnamed(FunctionArgExpr::Expr(e)) => e,
        FunctionArg::Named {
            arg: FunctionArgExpr::Expr(e),
            ..
        } => e,
        _ => return None,
    };
    match expr {
        Expr::Value(v) => match &v.value {
            Value::SingleQuotedString(s) => Some(s.clone()),
            _ => None,
        },
        _ => None,
    }
}

#[cfg(test)]
mod tests {