Sergey Petrunya fd4c9af398 MDEV-6442: Assertion `join->best_read < double(...)' failed with optimizer_use_condition_selectivity >=3 ...

- Fix the crash by making get_column_range_cardinality() 
  to handle the special case where Column_stats objects 
  is an all-zeros object (the question of what is the point
  of having Field::read_stats point to such object remains a 
  mystery)

- Added a few comments. Learning the code still.

2014-10-06 15:29:22 +04:00

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