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The code used a PG_RETURN_TIMESTAMPTZ() where the return type is
TimestampTz and not a Datum.
On 64-bit systems, there is no effect since this just ends up casting
64-bit integers back and forth. On 32-bit systems, timestamptz is
pass-by-reference. PG_RETURN_TIMESTAMPTZ() allocates new memory and
returns the address, meaning that the caller could interpret this as a
timestamp value.
The effect is using "date_trunc(..., 'infinity'::timestamptz) will
return random values (instead of the correct return value 'infinity').
Bug introduced in commit
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