presto-main/src/main/java/io/prestosql/operator/scalar/ArraySubscriptOperator.java/ArraySubscriptOperator/ArraySubscriptOperator
class ArraySubscriptOperator:    protected ArraySubscriptOperator()
    {
        super(SUBSCRIPT,
                ImmutableList.of(typeVariable("E")),
                ImmutableList.of(),
                new TypeSignature("E"),
                ImmutableList.of(arrayType(new TypeSignature("E")), BIGINT.getTypeSignature()),
                true);
    }