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| author | unknown <timour@askmonty.org> | 2010-07-18 15:59:24 +0300 |
|---|---|---|
| committer | unknown <timour@askmonty.org> | 2010-07-18 15:59:24 +0300 |
| commit | aa195b25704b4e67423654422ce0b601b54f809d (patch) | |
| tree | 8397078e60a3643a5261bcb6895e8ecf6fb3d558 /sql/sql_union.cc | |
| parent | 78ddd9ffe621697a8518bf0a82821032d4ff48fe (diff) | |
| download | mariadb-git-aa195b25704b4e67423654422ce0b601b54f809d.tar.gz | |
MWL#89: Cost-based choice between Materialization and IN->EXISTS transformation
Step2 in the separation of the creation of IN->EXISTS equi-join conditions from
their injection. The goal of this separation is to make it possible that the
IN->EXISTS conditions can be used for cost estimation without actually modifying
the subquery.
This patch separates row_value_in_to_exists_transformer() into two methods:
- create_row_value_in_to_exists_cond(), and
- inject_row_value_in_to_exists_cond()
The patch performs minimal refactoring of the code so that it is easier to solve
problems resulting from the separation. There is a lot to be simplified in this
code, but this will be done separately.
Diffstat (limited to 'sql/sql_union.cc')
0 files changed, 0 insertions, 0 deletions