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Add Array::logical_null_count for inspecting number of null values
Add counter-part of `Array::null_count`, but counting the logical null values. This will be useful in DataFusion. Current alternative is to compute null mask (via `Array::logical_nulls()`) and do counting on it. Given this might be expensive and verbose, caller may naturally feel steer towards `Array::null_count` which may or may not be applicable, depending on the context.
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