and
Bug#33555: Group By Query does not correctly aggregate partitions

Backport of bug-33257 which is the same bug.

read_range_*() calls was not passed to the partition handlers,
but was translated to index_read/next family calls.
Resulting in duplicates rows and wrong aggregations.

mysql-test/r/partition_range.result:
  Bug#30573: Ordered range scan over partitioned tables returns some rows twice
  
  Updated result file
mysql-test/t/partition_range.test:
  Bug#30573: Ordered range scan over partitioned tables returns some rows twice
  
  Re-enabled the test
sql/ha_partition.cc:
  Bug#30573: Ordered range scan over partitioned tables returns some rows twice
  
  backport of bug-33257, correct handling of read_range_* calls,
  without converting them to index_read/next calls
sql/ha_partition.h:
  Bug#30573: Ordered range scan over partitioned tables returns some rows twice
  
  backport of bug-33257, correct handling of read_range_* calls,
  without converting them to index_read/next calls