MySQL [db]> SELECT SUM(a.r[1]) as active_user_num, SUM(a.r[2]) as active_user_num_1day, SUM(a.r[3]) as active_user_num_3day, SUM(a.r[4]) as active_user_num_7day FROM ( SELECT user_id, retention( day = '2022-11-01', day = '2022-11-02', day = '2022-11-04', day = '2022-11-07') as r FROM login_event WHERE (day >= '2022-11-01') AND (day <= '2022-11-21') GROUP BY user_id ) a;
ERROR 1105 (HY000): errCode = 2, detailMessage = sum requires a numeric parameter: sum(%element_extract%(a.r, 1))
in the previous, the result is:
```
mysql> select array_position([1, null], null);
+--------------------------------------+
| array_position(ARRAY(1, NULL), NULL) |
+--------------------------------------+
| NULL |
+--------------------------------------+
1 row in set (0.02 sec)
```
but after this commit, the result become:
```
mysql> select array_position([1, null], null);
+--------------------------------------+
| array_position(ARRAY(1, NULL), NULL) |
+--------------------------------------+
| 2 |
+--------------------------------------+
1 row in set (0.02 sec)
```
refractor DataTypeArray from_string, make it more clear;
support ',' and ']' inside string element, for example: ['hello,,,', 'world][]']
support empty elements, such as [,] ==> [0,0]
Co-authored-by: cambyzju <zhuxiaoli01@baidu.com>
Previous logic of reverse function might not be strong enough to handle illegal character. For example, one one byte size character would be mistaken as one utf-8 character which occupies more than one byte space. And unfortunately exceeding the buffer space during future process.
From now, we don't support type derivation for array function's arguments.
So that the cases below will return wrong values or even cause be core.
mysql> select array_union([1],[10000000]);
+----------------------------------------+
| array_union(ARRAY(1), ARRAY(10000000)) |
+----------------------------------------+
| [1, -128] |
+----------------------------------------+
1 row in set (0.03 sec)
mysql> select array_union([NULL],[1]);
ERROR 1105 (HY000): RpcException, msg: io.grpc.StatusRuntimeException: UNAVAILABLE: Network closed for unknown reason
mysql> select array_union([],[1]);
ERROR 1105 (HY000): RpcException, msg: io.grpc.StatusRuntimeException: UNAVAILABLE: Network closed for unknown reason
This commit make a small fix to derivate the argument types of the array function
1、 For null type in arguments, cast the null type to boolean type, because null type should not be seen in be.
2、For different types in arguments, cast all arguments type to their compatible type.
this pr is used to fix the wrong result of array_join function.
before the change, the array_join function will return wrong result.
MySQL [example_db]> select array_join(["", "1", "2"], '');
+--------------------------------------+
| array_join(ARRAY('', '1', '2'), '') |
+--------------------------------------+
| 1_2 |
+--------------------------------------+
3.after the change, the array_join function will return correct result.
MySQL [example_db]> select array_join(["", "1", "2"], '');
+--------------------------------------+
| array_join(ARRAY('', '1', '2'), '') |
+--------------------------------------+
| _1_2 |
+--------------------------------------+
Issue Number: #7570
