Sql. Reduce try/catch block used to wrap Exception into RUNTIME_ERR SqlException in ScanNode#push

        try {
            if (inst == null) {
                inst = func.createInstance(context());
            }

            int processed = 0;
            while (requested > 0 && inst.hasNext()) {
                checkState();

                requested--;
                downstream().push(inst.next());

                if (++processed == inBufSize && requested > 0) {
                    // allow others to do their job
                    context().execute(this::push, this::onError);

                    return;
                }
            }
        } catch (Exception e) {
            throw new SqlException(Sql.RUNTIME_ERR, e);
        }

inst = func.createInstance(context());