[SPARK-13131] [SQL] Use best and average time in benchmark#11018

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davies wants to merge 6 commits intoapache:masterfrom

davies:gen_bench

Commits on Feb 2, 2016

tune the benchmark
Davies Liu
committed

Commits on Feb 3, 2016

switch to median time
Davies Liu
committed
update benchmark
Davies Liu
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Merge branch 'master' of github.com:apache/spark into gen_bench
Davies Liu
committed
update benchmarks
Davies Liu
committed
ignore benchmark tests
Davies Liu
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