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