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Make sure the group_concat() function returns an empty string, not a NULL,

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if it has at least one input row.  Fix for ticket [55746f9e65f8587].

FossilOrigin-Name: 0deac8737545a020d344be96fff16660a7977ab8
This commit is contained in:
drh
2014-05-07 17:19:31 +00:00
parent 731dc0cb0e
commit eacc050f30
4 changed files with 21 additions and 10 deletions
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12
test/func.test
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@ -1194,6 +1194,18 @@ do_test func-24.12 {
WHEN 'program' THEN null ELSE t1 END) FROM tbl1
}
} {,is,free,software}
# Tests to verify ticket http://www.sqlite.org/src/tktview/55746f9e65f8587c0
do_test func-24.13 {
execsql {
SELECT typeof(group_concat(x)) FROM (SELECT '' AS x);
}
} {text}
do_test func-24.14 {
execsql {
SELECT typeof(group_concat(x,''))
FROM (SELECT '' AS x UNION ALL SELECT '');
}
} {text}
# Use the test_isolation function to make sure that type conversions