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c1bf045dd4
Extended QB_NAME hint to support path-based addressing of query blocks
nested within views, derived tables, and CTEs, following TiDB's syntax.
New syntax:
QB_NAME(name, query_block_path), where
query_block_path ::= query_block_path_element
[ {. query_block_path_element }... ]
query_block_path_element ::= @ qb_path_element_select_num |
qb_path_element_view_sel
qb_path_element_view_sel ::= qb_path_element_view_name
[ @ qb_path_element_select_num ]
For example,
`SELECT /*+ qb_name(qb_v1, v1) */* FROM v1`
The name `qb_v1` is assigned to the inner query block of the view `v1`.
`SELECT /*+ qb_name(qb_v1, v1@sel_1) */* FROM v1`
Means the same but specifies that `v1` is present in SELECT#1 of the current
query block.
`SELECT /*+ qb_name(qb_v1, v1@sel_1 .@sel_2) */* FROM v1`
This means SELECT#2 of view `v1`, which is present in SELECT#1 of
the current query block, gets the name `qb_v1`.
It is possible to specify not only view names but also derived tables
and CTE's in the path.
Views and derived tables may be nested on multiple levels, for example:
`SELECT /*+ qb_name(dt2_dt1_v1_1, dt1 .dt2 .v2 .@SEL_2)
no_index(t1@dt2_dt1_v1_1)*/ v1.*
FROM v1 JOIN (SELECT v1.* FROM v1 JOIN (SELECT * FROM v2) dt2) dt1`
Limitations:
- Only SELECT statements support QB names with path. DML operations
(UPDATE, DELETE, INSERT) only support explicitly defined QB names
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| BUILD | ||
| client | ||
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| dbug | ||
| debian | ||
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| libmysqld | ||
| libservices | ||
| man | ||
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| mysys | ||
| mysys_ssl | ||
| plugin | ||
| randgen/conf | ||
| scripts | ||
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| win | ||
| wsrep-lib@7010f0ab58 | ||
| zlib | ||
| .clang-format | ||
| .gitattributes | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .gitmodules | ||
| appveyor.yml | ||
| BUILD-CMAKE | ||
| CMakeLists.txt | ||
| CODING_STANDARDS.md | ||
| config.h.cmake | ||
| configure.cmake | ||
| CONTRIBUTING.md | ||
| COPYING | ||
| CREDITS | ||
| INSTALL-SOURCE | ||
| INSTALL-WIN-SOURCE | ||
| KNOWN_BUGS.txt | ||
| mariadb-plugin-columnstore.install.generated | ||
| README.md | ||
| SECURITY.md | ||
| THIRDPARTY | ||
| VERSION | ||
Code status:
ci.appveyor.com
MariaDB: The innovative open source database
MariaDB was designed as a drop-in replacement for MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
MariaDB is brought to you by the MariaDB Foundation and the MariaDB Corporation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB.
MariaDB is developed by many of the original developers of MySQL who now work for the MariaDB Corporation, the MariaDB Foundation and by many people in the community.
MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors.
A description of the MariaDB project and a manual can be found at:
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
https://mariadb.com/kb/en/new-and-old-releases/
Getting the code, building it and testing it
Refer to the following guide: https://mariadb.org/get-involved/getting-started-for-developers/get-code-build-test/ which outlines how to build the source code correctly and run the MariaDB testing framework, as well as which branch to target for your contributions.
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