array_sortby
array_sortby
description
Syntax
ARRAY<T> array_sortby(ARRAY<T> src,Array<T> key)
ARRAY<T> array_sortby(lambda,array....)首先将 key 列升序排列，然后将 src 列按此顺序排序后的对应列做为结果返回; 如果输入数组 src 为 NULL，则返回 NULL。 如果输入数组 key 为 NULL，则直接返回 src 数组。 如果输入数组 key 元素包含 NULL, 则输出的排序数组会将 NULL 放在最前面。
example
mysql [test]>select array_sortby(['a','b','c'],[3,2,1]);
+----------------------------------------------------+
| array_sortby(ARRAY('a', 'b', 'c'), ARRAY(3, 2, 1)) |
+----------------------------------------------------+
| ['c', 'b', 'a'] |
+----------------------------------------------------+
mysql [test]>select array_sortby([1,2,3,4,5],[10,5,1,20,80]);
+-------------------------------------------------------------+
| array_sortby(ARRAY(1, 2, 3, 4, 5), ARRAY(10, 5, 1, 20, 80)) |
+-------------------------------------------------------------+
| [3, 2, 1, 4, 5] |
+-------------------------------------------------------------+
mysql [test]>select *,array_sortby(c_array1,c_array2) from test_array_sortby order by id;
+------+-----------------+-------------------------+--------------------------------------+
| id | c_array1 | c_array2 | array_sortby(`c_array1`, `c_array2`) |
+------+-----------------+-------------------------+--------------------------------------+
| 0 | NULL | [2] | NULL |
| 1 | [1, 2, 3, 4, 5] | [10, 20, -40, 80, -100] | [5, 3, 1, 2, 4] |
| 2 | [6, 7, 8] | [10, 12, 13] | [6, 7, 8] |
| 3 | [1] | [-100] | [1] |
| 4 | NULL | NULL | NULL |
| 5 | [3] | NULL | [3] |
| 6 | [1, 2] | [2, 1] | [2, 1] |
| 7 | [NULL] | [NULL] | [NULL] |
| 8 | [1, 2, 3] | [3, 2, 1] | [3, 2, 1] |
+------+-----------------+-------------------------+--------------------------------------+
mysql [test]>select *, array_map((x,y)->(y+x),c_array1,c_array2) as arr_sum,array_sortby((x,y)->(y+x),c_array1,c_array2) as arr_sort from array_test2;
+------+-----------------+--------------+----------------+-----------------+
| id | c_array1 | c_array2 | arr_sum | arr_sort |
+------+-----------------+--------------+----------------+-----------------+
| 1 | [1, 2, 3] | [10, 11, 12] | [11, 13, 15] | [1, 2, 3] |
| 2 | [4, 3, 5] | [10, 20, 30] | [14, 23, 35] | [4, 3, 5] |
| 3 | [-40, 30, -100] | [30, 10, 20] | [-10, 40, -80] | [-100, -40, 30] |
+------+-----------------+--------------+----------------+-----------------+keywords
ARRAY, SORT, ARRAY_SORTBY