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MDEV-16620: Add JSON_ARRAYAGG function

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The JSON_ARRAYAGG function extends the GROUP_CONCAT function and provides
a method of aggregating JSON results. The current implementation supports
DISTINCT and LIMIT but not ORDER BY (Oracle supports GROUP BY).

Adding GROUP BY support is possible but it requires some extra work as the
grouping appears to be done inside a temporary table that complicates
matters.

Added test cases that covert aggregation of all JSON types and JSON
validation for the generated results.
This commit is contained in:
Markus Mäkelä
2019-07-04 13:12:08 +03:00
parent 4d6a90942c
commit d0fc07c85f
8 changed files with 354 additions and 5 deletions
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90
mysql-test/main/func_json.test
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@ -606,6 +606,96 @@ SELECT * FROM t1 WHERE CASE WHEN JSON_OBJECT('x', (SELECT MAX(a=2) FROM t1))='{"
SELECT * FROM t1 WHERE CASE WHEN JSON_OBJECT('x', (SELECT MAX(a=2) FROM t1))='{"x": false}' THEN a END;
DROP TABLE t1;
-- echo #
-- echo # MDEV-16620 JSON_ARRAYAGG
-- echo #
-- echo #
-- echo # Integer aggregation
-- echo #
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1, 1),(2, 1), (1, 1),(2, 1), (3, 2),(2, 2),(2, 2),(2, 2);
SELECT JSON_VALID(JSON_ARRAYAGG(a)) FROM t1;
SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1;
SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1 GROUP BY b;
DROP TABLE t1;
-- echo #
-- echo # Real aggregation
-- echo #
CREATE TABLE t1 (a FLOAT, b DOUBLE, c DECIMAL(10, 2));
INSERT INTO t1 VALUES (1.0, 2.0, 3.0),(1.0, 3.0, 9.0),(1.0, 4.0, 16.0),(1.0, 5.0, 25.0);
SELECT JSON_VALID(JSON_ARRAYAGG(a)) FROM t1;
SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b), JSON_ARRAYAGG(c) FROM t1;
DROP TABLE t1;
-- echo #
-- echo # Boolean aggregation
-- echo #
CREATE TABLE t1 (a BOOLEAN, b BOOLEAN);
INSERT INTO t1 VALUES (TRUE, TRUE), (TRUE, FALSE), (FALSE, TRUE), (FALSE, FALSE);
SELECT JSON_VALID(JSON_ARRAYAGG(a)) FROM t1;
SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1;
SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1 GROUP BY b;
SELECT JSON_ARRAYAGG(TRUE), JSON_ARRAYAGG(FALSE) FROM t1;
DROP TABLE t1;
-- echo #
-- echo # Aggregation of strings with quoted
-- echo #
CREATE TABLE t1 (a VARCHAR(80));
INSERT INTO t1 VALUES
('"double_quoted_value"'), ("'single_quoted_value'"),
('"double_quoted_value"'), ("'single_quoted_value'");
SELECT JSON_VALID(JSON_ARRAYAGG(a)) FROM t1;
SELECT JSON_ARRAYAGG(a) FROM t1;
DROP TABLE t1;
-- echo #
-- echo # Strings and NULLs
-- echo #
CREATE TABLE t1 (a INT, b VARCHAR(80));
INSERT INTO t1 VALUES
(1, "Hello"),(1, "World"), (2, "This"),(2, "Will"), (2, "Work"),(2, "!"), (3, NULL),
(1, "Hello"),(1, "World"), (2, "This"),(2, "Will"), (2, "Work"),(2, "!"), (3, NULL);
SELECT JSON_VALID(JSON_ARRAYAGG(b)) FROM t1;
SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1;
SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1 GROUP BY a;
-- echo #
-- echo # DISTINCT and LIMIT
-- echo #
SELECT JSON_ARRAYAGG(b LIMIT 1) FROM t1;
SELECT JSON_ARRAYAGG(b LIMIT 2) FROM t1;
SELECT JSON_ARRAYAGG(b LIMIT 1) FROM t1 GROUP BY b;
SELECT JSON_ARRAYAGG(b LIMIT 2) FROM t1 GROUP BY a;
SELECT JSON_ARRAYAGG(DISTINCT a) FROM t1;
SELECT JSON_ARRAYAGG(DISTINCT b) FROM t1;
SELECT JSON_ARRAYAGG(DISTINCT a LIMIT 2) FROM t1;
SELECT JSON_ARRAYAGG(DISTINCT b LIMIT 2) FROM t1;
-- echo #
-- echo # JSON aggregation
-- echo #
SELECT JSON_VALID(JSON_ARRAYAGG(JSON_ARRAY(a, b))) FROM t1;
SELECT JSON_ARRAYAGG(JSON_ARRAY(a, b)) FROM t1;
SELECT JSON_ARRAYAGG(JSON_ARRAY(a, b)) FROM t1 GROUP BY a;
SELECT JSON_VALID(JSON_ARRAYAGG(JSON_OBJECT('a', a, 'b', b))) FROM t1;
SELECT JSON_ARRAYAGG(JSON_OBJECT('a', a, 'b', b)) FROM t1;
SELECT JSON_ARRAYAGG(JSON_OBJECT('a', a, 'b', b)) FROM t1 GROUP BY a;
-- echo #
-- echo # Error checks
-- echo #
--error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT
SELECT JSON_ARRAYAGG(a, b) FROM t1;
--error ER_INVALID_GROUP_FUNC_USE
SELECT JSON_ARRAYAGG(JSON_ARRAYAGG(a, b)) FROM t1;
DROP TABLE t1;
--echo #