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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.
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