Alex Behm has uploaded this change for review. ( http://gerrit.cloudera.org:8080/9078
Change subject: IMPALA-6422: Use ldexp() instead of powf() in HLL. ...................................................................... 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 poing power of two computations are relevant. Testing: - core/hdfs run passed Change-Id: I517614d3f9cf1cf56b15a173c3cfe76e0f2e0382 --- M be/src/exprs/aggregate-functions-ir.cc 1 file changed, 1 insertion(+), 1 deletion(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/78/9078/1 -- To view, visit http://gerrit.cloudera.org:8080/9078 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: I517614d3f9cf1cf56b15a173c3cfe76e0f2e0382 Gerrit-Change-Number: 9078 Gerrit-PatchSet: 1 Gerrit-Owner: Alex Behm <[email protected]>
