Rebase 10.7-selectivity tree

> commit a91f4f7d6e676644b349a63995ff8856e5081bce

> Author: Monty <monty@mariadb.org>

> Date:   Mon Nov 1 12:34:24 2021 +0200

>

>     Update row and key fetch cost models to take into account data copy costs

@@ -562,10 +562,7 @@ LEFT JOIN t1 ON t4.f1 = t1.f1

 JOIN t5 ON t4.f3 ON t3.f1 = t5.f5 ON t2.f4 = t3.f4

 WHERE t3.f2 ;

 id     select_type     table   type    possible_keys   key     key_len ref     rows    Extra

-1      SIMPLE  t3      ALL     NULL    NULL    NULL    NULL    2       Using where

-1      SIMPLE  t5      ref     f5      f5      5       test.t3.f1      2       Using where; Using index

-1      SIMPLE  t4      ALL     NULL    NULL    NULL    NULL    3       Using where

-1      SIMPLE  t2      ALL     f4      NULL    NULL    NULL    11      Using where; Using join buffer (flat, BNL join)

+1      SIMPLE  NULL    NULL    NULL    NULL    NULL    NULL    NULL    Impossible WHERE noticed after reading const tables

 # ^^ The above must not produce a QEP of t3,t5,t2,t4

 #    as that violates the "no interleaving of outer join nests" rule.

 DROP TABLE t1,t2,t3,t4,t5;