facebook/presto — pull request #1098 by miniway (2014-03-04 23:38:32+00:00)
Title: Resize groupby ChannelBuilder if there is no space for the frist row

Sometimes channels' value size on group by clause can be larger than the default 64K. Rather than raising exception, "Could not add row to empty page builder", it would be good to allocate a larger slice.