Varun Gupta 6dbc2ab8b3 MDEV-17752: Plan changes from hash_index_merge to index_merge with new optimizer defaults ...

The code in best_access_path function, when it does not find a key suitable for ref access
and join_cache_level is set to a value so that hash_join is possible we build a hash key.
Later in the function we compare the cost of ref access with table scan (or index scan
or quick selects). No need to do this when we have got the hash key.

2019-05-21 23:29:13 +05:30

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