Function convert_expr_depth

nodedb-sql/src/resolver/expr/convert.rs:45–55

Internal recursive helper that carries a depth counter to enforce `MAX_CONVERT_DEPTH` and prevent stack overflow on malformed ASTs.

(expr: &Expr, depth: &mut usize)

/// Internal recursive helper that carries a depth counter to enforce
/// `MAX_CONVERT_DEPTH` and prevent stack overflow on malformed ASTs.
pub(super) fn convert_expr_depth(expr: &Expr, depth: &mut usize) -> Result<SqlExpr> {
    *depth += 1;
    if *depth > MAX_CONVERT_DEPTH {
        return Err(SqlError::Unsupported {
            detail: format!("expression nesting depth exceeds maximum of {MAX_CONVERT_DEPTH}"),
        });
    }
    let result = convert_expr_inner(expr, depth);
    *depth -= 1;
    result
}

fn convert_expr_inner(expr: &Expr, depth: &mut usize) -> Result<SqlExpr> {
    match expr {