@Override
    public Boolean getBoolean(int index) {
        return rows.get(row).getBoolean(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