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Fixes #4291
The following issues appear throughout these cases are the following:
UNIQUE
can be used as a standalone column constraint:However,
parser.py::_parse_unique()
can end up consuming the following constraints, so this PR overrides it to add the appropriate lookahead.Implicit aliases can be used in column definitions, e.g:Which is solved by overridingparser.py::_parse_field_def()
to also parse the alias & generating it back without theAS
prefix.