+ """Read statistics from parquet.
+
+ It reads from:
+ - Suite Result Analysis (SRA) partition,
+ - NDRPDR trending partition,
+ - MRR trending partition.
+
+ :param days: Number of days back to the past for which the data will be
+ read.
+ :type days: int
+ :returns: tuple of pandas DataFrame-s with data read from specified
+ parquets.
+ :rtype: tuple of pandas DataFrame-s