Accumulo translator: null values not returned for <> criteria in WHERE clause

For columns, which contain some null values, a query like:

SELECT nullable_column FROM table_name WHERE nullable_column <> some_value

doesn't return null values.

Simple select works:

SELECT nullable_column FROM table_name

returns all rows regardless whether they are null or not.

IS NULL criteria in WHERE clause also work:

SELECT nullable_column FROM table_name WHERE nullable_column IS NULL

returns correct number of null values.