Igor Babaev a1fd25c22b MDEV-17017 Explain for query using derived table specified with a table ...

value constructor shows wrong number of rows

If the specification of a derived table contained a table value constructor
then the optimizer incorrectly estimated the number of rows in the derived
table. This happened because the optimizer did not take into account the
number of rows in the constructor. The wrong estimate could lead to choosing
inefficient execution plans.

2018-08-21 12:27:29 -07:00

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