With the help of Cédric, here's a patch changing the TRUNCATE TABLE
command, adding the IF EXISTS option to allow the presence in the list
of tables of a missing or invisible table.
This meets the needs of scripts that should be run in different stages,
and do not always have the same visibility on the tables, as well as
DROP TABLE. Rather than rollback the entire TRUNCATE or transaction, we
prefer to ignore the absence of the table.
It is a small patch which changes very little code, but that could be
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