THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The legacy behavior of these function doesn't consider the local time zone, and the return type of PROCTIME()/NOW()/CURRENT_TIMESTAMP is TIMESTAMP, the return type of CURRENT_DATE is DATE, the return type of CURRENT_TIME is TIME.
4. Support defining row time attribute on TIMESTAMP
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_LTZ
After this, we can support ROWTIME/PROCTIME on type TIMESTAMP WITH LOCAL TIME ZONE, which complements the unifcation.
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