Function extract_frame_offset

nodedb-sql/src/planner/window/frame.rs:86–96

Parse a frame offset from a literal. Only non-negative integer literals that fit in a `u64` are accepted; anything else (expression, float, oversized literal that fails to parse) is rejected at plan time rather than silently truncated.

(expr: &ast::Expr)

/// literal that fails to parse) is rejected at plan time rather than silently
/// truncated.
fn extract_frame_offset(expr: &ast::Expr) -> Result<u64> {
    if let ast::Expr::Value(v) = expr
        && let ast::Value::Number(n, _) = &v.value
        && let Ok(parsed) = n.parse::<u64>()
    {
        return Ok(parsed);
    }
    Err(SqlError::Unsupported {
        detail: format!("window frame offset must be a non-negative integer literal, got {expr}"),
    })
}

#[cfg(test)]
mod tests {