Hello! Please review and sponsor the following patch: http://cr.openjdk.java.net/~tvaleev/webrev/8153293/r1/
The patch preserves more characteristics on primitive stream operations: IntStream/LongStream/DoubleStream.boxed() preserves SORTED and DISTINCT IntStream.asLongStream() preserves SORTED and DISTINCT IntStream.asDoubleStream() and LongStream.asDoubleStream() preserves SORTED (different longs can be converted into the same double, so DISTINCT is not preserved here; not sure whether this is possible for ints) Fixing the boxed() case is especially important as distinct() for primitive streams is implemented like boxed().distinct().unbox, so the actual distinct() operation cannot take the advantage of DISTINCT flag (skip the operation at all) or SORTED flag (switch to more efficient implementation). Here's the small JMH benchmark which measures the performance boost of quite common operation: sort the input numbers and leave only distinct ones: http://cr.openjdk.java.net/~tvaleev/webrev/8153293/jmh/ new Random(1).ints(size).sorted().distinct().toArray() I've got the following results. 9ea+111: Benchmark (size) Mode Cnt Score Error Units SortDistinctTest.sortedDistinct 10 avgt 30 0,612 ± 0,004 us/op SortDistinctTest.sortedDistinct 1000 avgt 30 92,848 ± 1,039 us/op SortDistinctTest.sortedDistinct 100000 avgt 30 32147,205 ± 3487,422 us/op 9ea+111 patched: Benchmark (size) Mode Cnt Score Error Units SortDistinctTest.sortedDistinct 10 avgt 30 0,435 ± 0,001 us/op SortDistinctTest.sortedDistinct 1000 avgt 30 40,555 ± 0,772 us/op SortDistinctTest.sortedDistinct 100000 avgt 30 9031,651 ± 73,956 us/op With best regards, Tagir Valeev.
