GitHub - lemire/externalsortinginjava: External-Memory Sorting in Java
import com.google.code.externalsorting.CsvExternalSort; import com.google.code.externalsorting.CsvSortOptions; // provide a comparator Comparator<CSVRecord> comparator = (op1, op2) -> op1.get(0).compareTo(op2.get(0)); //... inputfile: input file name //... outputfile: output file name //...provide sort options CsvSortOptions sortOptions = new CsvSortOptions .Builder(comparator, CsvExternalSort.DEF
Fast Intersection of Sorted Lists Using SSE Instructions
Intersection of sorted lists is a cornerstone operation in many applications including search engines and databases because indexes are often implemented using different types of sorted structures. At GridDynamics, we recently worked on a custom database for realtime web analytics where fast intersection of very large lists of IDs was a must for good performance. From a functional point of view, w
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