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MDEV-27151: JSON_VALUE() does not parse NULL properties properly

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Analysis: JSON_VALUE() returns "null" string instead of NULL pointer.
Fix: When the type is JSON_VALUE_NULL (which is also a scalar) set
null_value to true and return 0 instead of returning string.
This commit is contained in:
Rucha Deodhar
2022-08-01 19:39:09 +05:30
parent d7ba72ea9b
commit d48428e99a
3 changed files with 52 additions and 1 deletions
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27
mysql-test/main/func_json.result
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@@ -1016,5 +1016,32 @@ j
{"ID": "4", "Name": "Betty", "Age": 19}
drop table t1;
#
# MDEV-27151: JSON_VALUE() does not parse NULL properties properly
#
#
# It is correct for JSON_EXTRACT() to give null instead of "NULL" because
# it returns the json literal that is put inside json.
# Hence it should return null as in 'null' string and not SQL NULL.
# JSON_VALUE() returns the "VALUE" so it is correct for it to return SQl NULL
#
SELECT NULL;
NULL
NULL
SELECT JSON_VALUE('{"nulltest": null}', '$.nulltest');
JSON_VALUE('{"nulltest": null}', '$.nulltest')
NULL
SELECT 1 + NULL;
1 + NULL
NULL
SELECT 1 + JSON_VALUE('{"nulltest": null}', '$.nulltest');
1 + JSON_VALUE('{"nulltest": null}', '$.nulltest')
NULL
SELECT NULL;
NULL
NULL
SELECT JSON_EXTRACT('{"a":null, "b":10, "c":"null"}', '$.a');
JSON_EXTRACT('{"a":null, "b":10, "c":"null"}', '$.a')
null
#
# End of 10.3 tests
#