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MDEV-22840: JSON_ARRAYAGG gives wrong results with NULL values and ORDER by clause

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The problem here is similar to the case with DISTINCT, the tree used for ORDER BY
needs to also hold the null bytes of the record. This was not done for GROUP_CONCAT
as NULLS are rejected by GROUP_CONCAT.

Also introduced a comparator function for the order by tree to handle null
values with JSON_ARRAYAGG.
This commit is contained in:
Varun Gupta
2020-06-09 16:24:18 +05:30
parent 0f6f0daa4d
commit ab9bd6284c
4 changed files with 131 additions and 5 deletions
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18
mysql-test/main/func_json.test
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@ -794,6 +794,24 @@ SELECT JSON_ARRAYAGG(DISTINCT a) FROM t1;
DROP TABLE t1;
--echo #
--echo # MDEV-22840: JSON_ARRAYAGG gives wrong results with NULL values and ORDER by clause
--echo #
CREATE TABLE t1(a VARCHAR(255));
INSERT INTO t1 VALUES ('red'),('blue');
SELECT JSON_ARRAYAGG(a) FROM t1;
SELECT JSON_ARRAYAGG(a ORDER BY a DESC) FROM t1;
SELECT JSON_ARRAYAGG(a ORDER BY a ASC) FROM t1;
INSERT INTO t1 VALUES (NULL);
SELECT JSON_ARRAYAGG(a) FROM t1;
SELECT JSON_ARRAYAGG(a ORDER BY a DESC) FROM t1;
SELECT JSON_ARRAYAGG(a ORDER BY a ASC) FROM t1;
DROP TABLE t1;
--echo #
--echo # End of 10.5 tests
--echo #