[SPARK-12913] [SQL] Improve performance of stat functions#10960

Closed

davies wants to merge 13 commits intoapache:masterfrom

Commits on Jan 27, 2016

improve stddev and variance
Davies Liu
committed

Commits on Jan 28, 2016

improve accuracy
Davies Liu
committed
atomic mutable projection
Davies Liu
committed
cleanup
Davies Liu
committed
reimplement corr/covariance
Davies Liu
committed
Merge branch 'master' of github.com:apache/spark into stddev
Davies Liu
committed

Commits on Jan 29, 2016

fix tests
Davies Liu
committed
Merge branch 'master' of github.com:apache/spark into stddev
Davies Liu
committed
update tests
Davies Liu
committed
disable udaf_covar_pop/udaf_covar_samp
Davies Liu
committed

Commits on Jan 30, 2016

Merge branch 'master' of github.com:apache/spark into stddev
Davies Liu
committed

Commits on Feb 2, 2016

address comments
Davies Liu
committed
address comments
Davies Liu
committed