presto-parquet/src/main/java/io/prestosql/parquet/ChunkKey.java/ChunkKey/equals
class ChunkKey:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        final ChunkKey other = (ChunkKey) obj;
        return Objects.equals(this.column, other.column)
                && Objects.equals(this.rowGroup, other.rowGroup);
    }