| 摘要 |
Profiling data includes accessing multiple collections of records to store quantitative information for each particular collection including, for at least one selected field of the records in the particular collection, a corresponding list of value count entries, each including a value appearing in the selected field and a count of the number of records in which the value appears. Processing the quantitative information of two or more collections includes: merging the value count entries of corresponding lists for at least one field from each of a first collection and a second collection to generate a combined list of value count entries, and aggregating value count entries of the combined list of value count entries to generate a list of distinct field value entries identifying a distinct value and including information quantifying a number of records in which the distinct value appears for each of the two or more collections. |
