Created by Sergey Vojtovich and last modified
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4450. By Sergey Vojtovich

Merged mroonga updates.

4449. By Sergey Vojtovich

Merge mroonga.

4448. By Sergey Petrunia


4447. By Alexander Barkov

MDEV-6649 Different warnings for TIME and TIME(N) when @@old_mode=zero_date_time_cast

4446. By Sergey Petrunia

MDEV-6879: Dereference of NULL primary_file->table in DsMrr_impl::get_disk_sweep_mrr_cost()

- Don't attempt to use BKA for materialized derived tables. The
  table is neither filled nor fully opened yet, so attempt to
  call handler->multi_range_read_info() causes crash.

4445. By Sergey Petrunia

MDEV-6878: Use of uninitialized saved_primary_key in Mrr_ordered_index_reader::resume_read()

- Make Mrr_ordered_index_reader::resume_read() restore index position
  only if it was saved before with Mrr_ordered_index_reader::interrupt_read().

4444. By Alexander Barkov

Merge 10.0-connect -> 10.0

4443. By Sergei Golubchik


4442. By Sergey Petrunia

MDEV-6519: Assertion `join->best_read < double(...)' failed after adding a key to a TokuDB table...

- calculate_cond_selectivity_for_table() should handle the case
  where index statistics is not available (zeros are returned
  in rec_per_key)

4441. By Sergey Petrunia

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

- Added a few comments. Learning the code still.

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