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