IMPALA-5840: Don't write page-level statistics in Parquet files.
IMPALA-5840: Don't write page-level statistics in Parquet files.

Page level statistics in Parquet files are expected to be deprecated in
favor of page indexes (PARQUET-922). This change disables writing
statistics to pages. Impala is currently the only project writing them.
Neither Impala nor other projects make use of these right now and by not
writing them anymore we prevent others from depending on soon-to-be
deprecated fields.

Change-Id: I1b05131320370171d76e93a46b04880a7f9b6d84
Reviewed-on: http://gerrit.cloudera.org:8080/7817
Reviewed-by: Lars Volker <4d73c29a4561048ce85fa0051bb7a6d201781159@cloudera.com>
Tested-by: Impala Public Jenkins

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala