Fix intermittent testcase as_alias
This case assumed that 'now' in bellow queries will produce different results. -- insert into xxx values (timestamp(2) without time zone 'now'); -- select timestamp(2) without time zone 'now'; However, the results are undetermined and may be equal on powerful agents, the test is all about as alias so it's ok to add 2 seconds to the second 'now' to guarantee they are never equal.
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