[BUG]: Conversion of Oracle outer joins with `(+)` syntax

[mattslack-db]

Category of Bug / Issue

Conversion (Oracle, Snowflake)

Current Behavior

The Bladebridge converter currently does not support converting Oracle outer joins using the "+" operator, here is an example of this:

FROM
EMPLOYEE, BRANCH
WHERE
EMPLOYEE.BRANCH=BRANCH.BRANCH(+)

This is documented in the Oracle docs here: https://docs.oracle.com/database/121/SQLRF/queries006.htm#SQLRF52354.

Note that they do not recommend using it either! However Snowflake does support it.

Expected Behavior

This should convert to:

FROM
EMPLOYEE LEFT OUTER JOIN BRANCH ON EMPLOYEE.BRANCH=BRANCH.BRANCH