ARRAYS_OVERLAP

Description

The arrays_overlap function is used to check if there is at least one common element between two arrays. Specifically, the function has the following features:

1. If array1 and array2 have at least one common element, the function returns true.
2. If the two arrays do not intersect, but at least one array contains a null value and both arrays are not empty, the function returns null.
3. In other cases, the function returns false.

Parameter Description

• array1, array2: The two arrays to be compared, of type array<T>, where T can be any data type supported by the database.

Return Type

• The return type is boolean or null.

Usage Example

1. Check if two arrays intersect:

SELECT arrays_overlap(array(1, 2, 3), array(3, 4, 5)); -- Returns true

2. When the array contains null:

SELECT arrays_overlap(array(1, 2, 3), array(null, 4, 5)); -- Returns null

3. Two non-empty arrays with no intersection:

SELECT arrays_overlap(array(1, 2, 3), array(4, 5, 6)); -- Returns false

4. A situation where an array is empty:

SELECT arrays_overlap(array(), array(1, 2, 3)); -- Returns false

5. The case where both arrays are empty:

SELECT arrays_overlap(array(), array()); -- Returns false

Notes

• When using the arrays_overlap function, please note that the types of array elements need to be consistent, otherwise the comparison may fail.
• If the array contains null values, the behavior of the function will be different, which needs special attention when using it.