facebook/presto — pull request #1093 by alexliu68 (2014-03-03 23:31:36+00:00)
Title: Use token range query is way faster than key Eq query, so lower the limi...

...t to 200

a simple test on select count(*) from stocks on a 3000 rows table . It takes 3 seconds to finish using token range. It takes about 20 seconds to finish using key equal clause.

So lower the limit to 200 to favor token range query than key equal clause.