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MDEV-18479 Assertion `join->best_read < double(1.79769313486231570815…
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…e+308L)'

or server crashes in JOIN::fix_all_splittings_in_plan after EXPLAIN

This patch resolves the problem of overflowing when performing
calculations to estimate the cost of an evaluated query execution plan.
The overflowing in a non-debug build could cause different kind of
problems uncluding crashes of the server.
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@igorbabaev
igorbabaev committed May 28, 2019
1 parent 4584c18 commit 0955462
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