Igor Babaev 5ec144cfab MDEV-17211 Server crash on query ...

The function JOIN_TAB::choose_best_splitting() did not take into account
that for some tables whose fields were used in the GROUP BY list of
the specification of a splittable materialized derived there might exist
no elements in the array ext_keyuses_for_splitting.

2018-09-17 18:50:21 -07:00

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