---

{ “title”: “GROUP_ARRAY_INTERSECT”, “language”: “en” }

Description

Calculate the intersection elements of the input array across all rows and return a new array.

Syntax

GROUP_ARRAY_INTERSECT(<expr>)

Parameters

Parameter	Description
<expr>	Array columns or array values that require intersection

Return Value

Returns an array containing the intersection results

Example

select c_array_string from group_array_intersect_test where id in (18, 20);

+------+---------------------------+
| id   | col                       |
+------+---------------------------+
|    1 | ["a", "b", "c", "d", "e"] |
|    2 | ["a", "b"]                |
|    3 | ["a", null]               |
+------+---------------------------+

select group_array_intersect(col) from group_array_intersect_test;

+----------------------------+
| group_array_intersect(col) |
+----------------------------+
| ["a"]                      |
+----------------------------+