MDEV-35353 set correct number of rows_examined for union all queries #4130
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For all union_all, as well as union queries, number of rows_examined was tracked and updated correctly. However, they are only being written to the slow query log in the case of UNION queries, but not for UNION_ALL queries. This PR addresses the concern to write rows_examined for UNION_ALL queries as well to the slow query log.
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Pull request created in: https://jira.mariadb.org/browse/MDEV-35353