countequal

SinceVersion 1.2.0

countequal

description

Syntax

BIGINT countequal(ARRAY<T> arr, T value)

判断数组中包含value元素的个数。返回结果如下:

  1. num - valuearray中的数量;
  2. 0 - value不存在数组arr中;
  3. NULL - 如果数组为NULL,或者valueNULL

notice

仅支持向量化引擎中使用

example

  1. mysql> set enable_vectorized_engine=true;
  2. mysql> select *, countEqual(c_array,5) from array_test;
  3. +------+-----------------+--------------------------+
  4. | id | c_array | countequal(`c_array`, 5) |
  5. +------+-----------------+--------------------------+
  6. | 1 | [1, 2, 3, 4, 5] | 1 |
  7. | 2 | [6, 7, 8] | 0 |
  8. | 3 | [] | 0 |
  9. | 4 | NULL | NULL |
  10. +------+-----------------+--------------------------+

keywords

ARRAY,COUNTEQUAL