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MDEV-31361 Wrong result on 2nd execution of PS for query with derived…
… table This bug led to wrong result sets returned by the second execution of prepared statements from selects using mergeable derived tables pushed into external engine. Such derived tables are always materialized. The decision that they have to be materialized is taken late in the function mysql_derived_optimized(). For regular derived tables this decision is usually taken at the prepare phase. However in some cases for some derived tables this decision is made in mysql_derived_optimized() too. It can be seen in the code of mysql_derived_fill() that for such a derived table it's critical to change its translation table to tune it to the fields of the temporary table used for materialization of the derived table and this must be done after each refill of the derived table. The same actions are needed for derived tables pushed into external engines. Approved by Oleksandr Byelkin <sanja@mariadb.com>
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