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--source include/have_debug_sync.inc
--echo # Bug#20554017 CONCAT MAY INCORRECTLY COPY OVERLAPPING STRINGS
SET @old_debug= @@session.debug;
SET session debug='d,force_fake_uuid';
do concat('111','11111111111111111111111111',
substring_index(uuid(),0,1.111111e+308));
do concat_ws(',','111','11111111111111111111111111',
substring_index(uuid(),0,1.111111e+308));
SET session debug= @old_debug;