Parquet/parquet-mr — pull request #164 by julienledem (2013-09-10 01:14:08+00:00)
Title: Dictionary changes

Lift limitations to maximum entries in dictionary.
Add setting for maximum size of dictionary.
make dictionary encoding enabled by default.
Should we add a threshold on average repetition count to use a dictionary?
if dic entry count > value count/2 we turn off dictionary?