Add ARRAY_MIN support in SQL & Table API

Find the minimum among all elements in the array for which ordering is supported.

Syntax:

array_min(array)

Arguments:
array: An ARRAY to be handled.

Returns:

The result matches the type of the elements. NULL elements are skipped. If array is empty, or contains only NULL elements, NULL is returned.

Examples:

SELECT array_min(array(1, 20, NULL, 3));
-- 1

See also
spark https://spark.apache.org/docs/latest/api/sql/index.html#array_min

presto https://prestodb.io/docs/current/functions/array.html