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ALTER TABLE test
ADD attr INT
--
ERROR: syntax error (2 : 5)
ADD attr INT
    ^
==

ALTER TABLE test
ADD COLUMN attr INT
--
ERROR: ALTER statements is not supported yet (1 : 1)
ALTER TABLE test
^
==

ALTER TABLE test
DROP COLUMN attr INT
--
[same as above]
==

ALTER TABLE test
ADD CONSTRAINT UNIQUE(attr)
--
ERROR: Table Constraints (UNIQUE) is not supported yet (2 : 16)
ADD CONSTRAINT UNIQUE(attr)
               ^
==

ALTER TABLE test
DROP CONSTRAINT constraint0
--
ERROR: ALTER statements is not supported yet (1 : 1)
ALTER TABLE test
^