Aggregation

Functions for computing statistics over collections.

• LENGTH(x) / COUNT(x) → size of strings, lists, or objects; 0 for null.
• SUM(list) → sum of numbers; errors on non-numeric entries; 0 when list is empty.
• AVG(list) → average or null when empty; errors on non-numeric entries.
• MIN(list) / MAX(list) → smallest/largest value or null when empty; errors on incomparable values.

Run it: Aggregation example.