Deprecate use of GLOBAL and LOCAL in temp table creation.
Aside from adjusting the documentation to say that these are deprecated, we now report a warning (not an error) for use of GLOBAL, since it seems fairly likely that we might change that to request SQL-spec-compliant temp table behavior in the foreseeable future. Although our handling of LOCAL is equally nonstandard, there is no evident interest in ever implementing SQL modules, and furthermore some other products interpret LOCAL as behaving the same way we do. So no expectation of change and no warning for LOCAL; but it still seems a good idea to deprecate writing it. Noah Misch
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