Igor Babaev 9cea4ccf12 MDEV-16726 Assertion `tab->type == JT_REF || tab->type == JT_EQ_REF' failed ...

Due to a legacy bug in the code of make_join_statistics() detecting
so-called constant tables could miss some of them in rare queries
that used RIGHT JOIN. As a result these queries had execution plans
different from the execution plans of the equivalent queries with
LEFT JOIN.
Besides starting from 10.2 this could trigger an assertion failure.

2018-07-19 15:31:46 -07:00

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