"qiumingcheng" <qiumingch...@aliyun.com> writes:
> 2. What's the reason about the function timestamp_gt_timestampz may cause 
> data leakage? Can you explain how it causes data leakage?

It's capable of throwing an error (see
timestamp2timestamptz_opt_overflow).  Now, maybe that's unreachable, or
maybe we could rerrange things to remove it.  But there's still enough
code underneath the timezone conversion requirement that I'd be very
hesitant to apply a leakproof marking.  In short: it might be leakproof
in practice, but we don't wish to offer a guarantee.

                        regards, tom lane


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