ARRAY_EXISTS
array_exists
array_exists(lambda,array1,array2....) array_exists(array1)
description
Syntax
BOOLEAN array_exists(lambda, ARRAY<T> arr1, ARRAY<T> arr2, ... )
BOOLEAN array_exists(ARRAY<T> arr)
使用一个可选lambda表达式作为输入参数，对其他的输入ARRAY参数的内部数据做对应表达式计算。当计算返回非0时，返回1；否则返回0。 在lambda表达式中输入的参数为1个或多个，必须和后面的输入array列数量一致。在lambda中可以执行合法的标量函数，不支持聚合函数等。 在没有使用lambda作为参数时，array1作为计算结果。
array_exists(x->x, array1);
array_exists(x->(x%2 = 0), array1);
array_exists(x->(abs(x)-1), array1);
array_exists((x,y)->(x = y), array1, array2);
array_exists(array1);
example
mysql [test]>select *, array_exists(x->x>1,[1,2,3]) from array_test2 order by id;
+------+-----------------+-------------------------+-----------------------------------------------+
| id | c_array1 | c_array2 | array_exists([x] -> x(0) > 1, ARRAY(1, 2, 3)) |
+------+-----------------+-------------------------+-----------------------------------------------+
| 1 | [1, 2, 3, 4, 5] | [10, 20, -40, 80, -100] | [0, 1, 1] |
| 2 | [6, 7, 8] | [10, 12, 13] | [0, 1, 1] |
| 3 | [1] | [-100] | [0, 1, 1] |
| 4 | NULL | NULL | [0, 1, 1] |
+------+-----------------+-------------------------+-----------------------------------------------+
4 rows in set (0.02 sec)
mysql [test]>select c_array1, c_array2, array_exists(x->x%2=0,[1,2,3]) from array_test2 order by id;
+-----------------+-------------------------+---------------------------------------------------+
| c_array1 | c_array2 | array_exists([x] -> x(0) % 2 = 0, ARRAY(1, 2, 3)) |
+-----------------+-------------------------+---------------------------------------------------+
| [1, 2, 3, 4, 5] | [10, 20, -40, 80, -100] | [0, 1, 0] |
| [6, 7, 8] | [10, 12, 13] | [0, 1, 0] |
| [1] | [-100] | [0, 1, 0] |
| NULL | NULL | [0, 1, 0] |
+-----------------+-------------------------+---------------------------------------------------+
4 rows in set (0.02 sec)
mysql [test]>select c_array1, c_array2, array_exists(x->abs(x)-1,[1,2,3]) from array_test2 order by id;
+-----------------+-------------------------+----------------------------------------------------+
| c_array1 | c_array2 | array_exists([x] -> abs(x(0)) - 1, ARRAY(1, 2, 3)) |
+-----------------+-------------------------+----------------------------------------------------+
| [1, 2, 3, 4, 5] | [10, 20, -40, 80, -100] | [0, 1, 1, 1, 1] |
| [6, 7, 8] | [10, 12, 13] | [1, 1, 1] |
| [1, NULL] | [-100] | [0, NULL] |
| NULL | NULL | NULL |
+-----------------+-------------------------+----------------------------------------------------+
4 rows in set (0.02 sec)
mysql [test]>select c_array1, c_array2, array_exists((x,y)->x>y,c_array1,c_array2) from array_test2 order by id;
+-----------------+-------------------------+-------------------------------------------------------------+
| c_array1 | c_array2 | array_exists([x, y] -> x(0) > y(1), `c_array1`, `c_array2`) |
+-----------------+-------------------------+-------------------------------------------------------------+
| [1, 2, 3, 4, 5] | [10, 20, -40, 80, -100] | [0, 0, 1, 0, 1] |
| [6, 7, 8] | [10, 12, 13] | [0, 0, 0] |
| [1] | [-100] | [1] |
| NULL | NULL | NULL |
+-----------------+-------------------------+-------------------------------------------------------------+
4 rows in set (0.02 sec)
mysql [test]>select *, array_exists(c_array1) from array_test2 order by id;
+------+-----------------+-------------------------+--------------------------+
| id | c_array1 | c_array2 | array_exists(`c_array1`) |
+------+-----------------+-------------------------+--------------------------+
| 1 | [1, 2, 3, 0, 5] | [10, 20, -40, 80, -100] | [1, 1, 1, 0, 1] |
| 2 | [6, 7, 8] | [10, 12, 13] | [1, 1, 1] |
| 3 | [0, NULL] | [-100] | [0, NULL] |
| 4 | NULL | NULL | NULL |
+------+-----------------+-------------------------+--------------------------+
4 rows in set (0.02 sec)
keywords
ARRAY,ARRAY_EXISTS
