MDEV-13817 add support for oracle left join syntax - the ( + )

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Parser changes made by Alexander Barkov <bar@mariadb.com>.

Part of the tests made by Iqbal Hassan <iqbal@hasprime.com>.
Initially marking with ORA_JOIN flag made also by
Iqbal Hassan <iqbal@hasprime.com>.

Main idea is that parser mark fields with (+) with a flag
(ORA_JOIN).

During Prepare the flag bring to the new created items if needed.

Later after preparing (fix_firlds()) WHERE confition the
relations betweel the tables analyzed and tables reordered
so to make JOIN/LEFT JOIN operators in chain equivalent to
the query with oracle outer join operator (+).

Then the flags of (+) removed.

...

This commit is contained in:

Oleksandr Byelkin

2025-05-12 16:23:20 +02:00

parent 58a2184f5d

commit dae5a99c73

26 changed files with 3560 additions and 34 deletions

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sql/sql_oracle_outer_join.cc Normal file

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