parquet-column/src/main/java/org/apache/parquet/filter2/predicate/FilterApi.java
public static <T extends Comparable<T>, C extends Column<T> & SupportsEqNotEq> NotEq<T> notEq(C column, T value) {
    return new NotEq<T>(column, value);
  }
public static <T extends Comparable<T>, C extends Column<T> & SupportsEqNotEq> NotEq<T> notEq(C column, T value) {
    return new NotEq<T>(column, value);
  }
Keeps records if their value is not equal to the provided value.
Nulls are treated the same way the java programming language does.
<p>
For example:
notEq(column, null) will keep all records whose value is not null.
notEq(column, 7) will keep all records whose value is not 7, including records whose value is null.

NOTE: this is different from how some query languages handle null. For example, SQL and pig will drop
nulls when you filter by not equal to 7. To achieve similar behavior in this api, do:
and(notEq(column, 7), notEq(column, null))

NOTE: be sure to read the {@link #lt}, {@link #ltEq}, {@link #gt}, {@link #gtEq} operator's docs
for how they handle nulls

@param column a column reference created by FilterApi
@param value a value that matches the column's type
@param <T> the Java type of values in the column
@param <C> the column type that corresponds to values of type T
@return a not-equals predicate for the given column and value