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Crash in UNIX_TIMESTAMP(STR_TO_DATE('2020','%Y'))

This SQL script crashes the server (debug build):

SET TIME_ZONE='+02:00'
SELECT UNIX_TIMESTAMP(STR_TO_DATE('2020','%Y'));

Stack trace:

#4 0x00000000006df193 in sec_since_epoch (year=2020, mon=0, mday=0, hour=0, min=0, sec=0)
at /home/bar/maria-bzr/maria-10.0-connect/sql/tztime.cc:799
#5 0x00000000006df9f9 in Time_zone_offset::TIME_to_gmt_sec (this=0x2887d40,
t=0x7fffcc2e92f0, error_code=0x7fffcc2e9324)
at /home/bar/maria-bzr/maria-10.0-connect/sql/tztime.cc:1385
#6 0x00000000006dc801 in TIME_to_timestamp (thd=0x2b1b920, t=0x7fffcc2e92f0,
error_code=0x7fffcc2e9324)
at /home/bar/maria-bzr/maria-10.0-connect/sql/sql_time.cc:420
#7 0x000000000086d016 in Item_func_unix_timestamp::get_timestamp_value (
this=0x7fff900067d8, seconds=0x7fffcc2e9350, second_part=0x7fffcc2e9358)
at /home/bar/maria-bzr/maria-10.0-connect/sql/item_timefunc.cc:1197

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