@Override
    public BigDecimal getBigDecimal(int index) {
        indexCheck();
        return (BigDecimal) rows.get(row).getValue(index);
    }
Looking at Vert.x source code this /should/ work.

@see io.apiman.gateway.engine.components.jdbc.IJdbcResultSet#getBigDecimal(int)
gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/components/jdbc/VertxJdbcResultSet.java