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~drizzle-trunk/drizzle/development 

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# 
# Run subselect.test without semi-join optimization (test materialize)
#
show variables like 'optimizer_switch';
set optimizer_switch='no_semijoin,no_materialization';

--source t/subselect.test

--error 1231
set optimizer_switch='';
set optimizer_switch=0;
show variables like 'optimizer_switch';