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MDEV-13817: Add support for oracle's left join syntax - the ( + ) in sql_mode=oracle #3807

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  • The Jira issue number for this PR is: MDEV-13817

Description

This implements the support for oracle's left join syntax by transforming the where clause of the query to a join condition in the parser.

Release Notes

Same as description.

How can this PR be tested?

mysql-test/mtr oracle_outer_join

Basing the PR against the correct MariaDB version

  • This is a new feature or a refactoring, and the PR is based against the main branch.
  • This is a bug fix, and the PR is based against the earliest maintained branch in which the bug can be reproduced.

PR quality check

  • I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
  • For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.

syntax - the ( + ) in sql_mode=oracle

This implements the support for oracle's left join syntax by transforming
the where clause of the query to a join condition in the parser.
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