Hi Below are some proposed items for Presto optimization:
1) Remove the extra loops for data conversion in Presto Format to increase the performance. 2) Modularize and optimize the filters . 3) Optimize the Carbondata Metadata reading. 4) Lazy decoding of the dictionary. 5) Batch reading of the rows in bulk to get good performance. 6) Vectorized reader implementation to read the columns instead of rows. Please discuss and comment. Regards Liang
