| 摘要 |
An apparatus, computer-readable medium, and computer-implemented method for efficiently performing operations on distinct data values, including storing a tokenized column of data in a table by mapping each unique data value in a corresponding domain to a unique entity ID, and replacing each of the data values in the column with the corresponding entity ID to generate a column of tokenized data containing one or more entity IDs, receiving a query directed to the column of data, the query defining one or more group sets for grouping the data retrieved in response to the query, and generating an entity map vector for each group set, the length of each entity map vector equal to the number of unique entity IDs for the domain, and the value of each bit in the entity map vector indicating the presence or absence of a different unique entity ID in the group set. |
