Alex Behm 1dfdc6704b IMPALA-6422: Use ldexp() instead of powf() in HLL. ...

Using ldexp() to compute a floating point power of two is
over 10x faster than powf().

This change is particularly helpful for speeding up
COMPUTE STATS TABLESAMPLE which has many calls to
HllFinalEstimate() where floating point power of two
computations are relevant.

Testing:
- core/hdfs run passed

Change-Id: I517614d3f9cf1cf56b15a173c3cfe76e0f2e0382
Reviewed-on: http://gerrit.cloudera.org:8080/9078
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: Impala Public Jenkins

2018-01-19 23:22:49 +00:00

..

generated-sources

IMPALA-3552: Make incremental stats max serialized size configurable

2016-11-15 03:22:11 +00:00

src

IMPALA-6422: Use ldexp() instead of powf() in HLL.

2018-01-19 23:22:49 +00:00

.gitignore

Updates several .gitignore files.

2017-08-31 01:40:47 +00:00

.impala.doxy

IMPALA-4110: Clean up issues found by Apache RAT.

2016-09-14 22:09:24 +00:00

CMakeLists.txt

IMPALA-4835 (prep only): create io subfolder and namespace

2017-11-17 22:47:34 +00:00