presto-jmx/src/main/java/io/prestosql/plugin/jmx/JmxColumnHandle.java/JmxColumnHandle/equals
class JmxColumnHandle:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        JmxColumnHandle other = (JmxColumnHandle) obj;
        return Objects.equals(this.columnName, other.columnName) &&
                Objects.equals(this.columnType, other.columnType);
    }