fe738d77f1
My "fix" for bugs #7578 and #6116 on DROP OWNED at fe3b5eb08a1 not only misstated that it applied to REASSIGN OWNED (which it did not affect), but it also failed to fix the problems fully, because I didn't test the case of owned shared objects. Thus I created a new bug, reported by Thomas Kellerer as #7748, which would cause DROP OWNED to fail with a not-for-user-consumption error message. The code would attempt to drop the database, which not only fails to work because the underlying code does not support that, but is a pretty dangerous and undesirable thing to be doing as well. This patch fixes that bug by having DROP OWNED only attempt to process shared objects when grants on them are found, ignoring ownership. Backpatch to 8.3, which is as far as the previous bug was backpatched.
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