... fact ta-ble that are accessed by the SSBM queries are not very compress-ible if they do not have order to them, since they are either keys(which have high cardinality) or are random values. ... thiscase, the index scans are relatively fast sequential scans of the en-tire index file, and do not require seeks between leaf pages. Thehash joins, however, are quite slow, as they combine two 60 ... of a query plan,since such are tuples immediately discarded.Note that once all of these optimizations are removed, the column-store acts like a row-store. Columns are immediately stitched to-gether...