This used to work in 10.0 and 10.1:
set time_zone='Europe/Moscow';
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create table t1 (a timestamp);
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set timestamp=1288481126;
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insert t1 values (null);
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select a, unix_timestamp(a) from t1;
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but in 10.2 it returns 1288477526 (one hour earlier).
Because both 1288481126 and 1288477526 are written as 2010-10-31 02:25:26 in time zone Europe/Moscow, and intermediate timestamp→datetime→timestamp conversion loses information.
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