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func_gconcat.test, func_gconcat.result:
Test case for bug #12859 group_concat in subquery cause incorrect not null. mysql-test/r/func_gconcat.result: Test case for bug #12859 group_concat in subquery cause incorrect not null. mysql-test/t/func_gconcat.test: Test case for bug #12859 group_concat in subquery cause incorrect not null.
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@ -551,3 +551,12 @@ DROP TABLE t1,t2;
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select * from (select group_concat('c') from DUAL) t;
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group_concat('c')
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NULL
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create table t1 ( a int not null default 0);
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select * from (select group_concat(a) from t1) t2;
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group_concat(a)
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NULL
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select group_concat('x') UNION ALL select 1;
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group_concat('x')
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NULL
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1
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drop table t1;
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