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(parent: a0ccae7) | patch

Throw an appropriate error if ALTER COLUMN TYPE finds a dependent trigger.

Throw an appropriate error if ALTER COLUMN TYPE finds a dependent trigger.

Actually making this case work, if the column is used in the trigger's
WHEN condition, will take some new code that probably isn't appropriate
to back-patch. For now, just throw a FEATURE_NOT_SUPPORTED error rather
than allowing control to reach the "unexpected object" case. Per bug #5688
from Daniel Grace. Back-patch to 9.0 where the possibility of such a
dependency was introduced.

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