facebook/presto — pull request #1114 by martint (2014-03-11 15:51:29+00:00)
Title: Use faster implementation of Murmur3 for approx_distinct

Noticeable speedup in approx_distinct benchmarks:

Before:
```
sql_approx_count_distinct_long :: 118.746 cpu ms :: in 1.5M, 12.9MB, 12.6M/s, 108MB/s :: out 1, 9B, 8/s, 75B/s
sql_approx_count_distinct_double :: 119.971 cpu ms :: in 1.5M, 12.9MB, 12.5M/s, 107MB/s :: out 1, 9B, 8/s, 75B/s
sql_approx_count_distinct_varbinary :: 163.847 cpu ms :: in 1.5M, 21.5MB, 9.15M/s, 131MB/s :: out 1, 9B, 6/s, 54B/s
```
After:
```
sql_approx_count_distinct_long :: 32.761 cpu ms :: in 1.5M, 12.9MB, 45.8M/s, 393MB/s :: out 1, 9B, 30/s, 274B/s
sql_approx_count_distinct_double :: 34.674 cpu ms :: in 1.5M, 12.9MB, 43.3M/s, 371MB/s :: out 1, 9B, 28/s, 259B/s
sql_approx_count_distinct_varbinary :: 79.983 cpu ms :: in 1.5M, 21.5MB, 18.8M/s, 268MB/s :: out 1, 9B, 12/s, 112B/s
```