If the first number in a row group written by Impala is NaN,
then Impala writes incorrect statistics in the metadata.
This will result in incorrect results when filtering the
data.
This commit fixes the read path when encountering NaNs in
Parquet min/max statistics. If min and max are both NaN, we
can't use the statistics at all. If only one of them is NaN,
the other still can be used.
I added some tests to QueryTest/parqet-stats.test
Change-Id: If3897fc1426541239223670812f59e2bed32f455
Reviewed-on: http://gerrit.cloudera.org:8080/9358
Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com>
Tested-by: Impala Public Jenkins
881e00a8bf