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| author | Varun Gupta <varunraiko1803@gmail.com> | 2018-03-27 02:48:55 +0530 |
|---|---|---|
| committer | Varun Gupta <varunraiko1803@gmail.com> | 2018-03-27 02:48:55 +0530 |
| commit | ba7b03001c12b5c895c8658ac1e68e0ad83f8428 (patch) | |
| tree | 128844a2795d072c3a8ffd3ccf6b5cea52ac3390 /sql/sql_class.h | |
| parent | 52ade8a54243df9354c38cb1af799e811cd05989 (diff) | |
| download | mariadb-git-10.3-MDEV-9959.tar.gz | |
MDEV-9959: A serious MariaDB server performance bug10.3-MDEV-9959
Step #2: If any field in the select list of the derived tables is present in the group by list also , then we are again guaranteed that ref access to the derived table would always produce one row per key.
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