To let users search by number or date, I want to provide two inputs. If you have two inputs, its a range search. If you have one input, it's a "greater than or equals" or "less than or equals". Will users understand they may leave one input blank? If not, how to make it discoverable?
values: 1 ,2, 3, 4, 5, 6, 7, 8, 9, 10
inputs: -- 5
meaning: "not greater than 5"
result: 1, 2, 3, 4, 5
5 --
"not less than 5"
5, 6, 7, 8, 9, 10
3 6
"not less than 3, not greater than 6"
3, 4, 5, 6