public LeadFunction(List<Integer> argumentChannels)
    {
        this.valueChannel = argumentChannels.get(0);
        this.offsetChannel = (argumentChannels.size() > 1) ? argumentChannels.get(1) : -1;
        this.defaultChannel = (argumentChannels.size() > 2) ? argumentChannels.get(2) : -1;
    }
@Test
    public void testLeadFunction()
    {
        assertWindowQuery("lead(orderdate) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, VARCHAR)
                        .row(3, "F", "1994-07-30")
                        .row(5, "F", "1992-02-21")
                        .row(6, "F", "1993-10-27")
                        .row(33, "F", null)
                        .row(1, "O", "1996-12-01")
                        .row(2, "O", "1995-10-11")
                        .row(4, "O", "1996-01-10")
                        .row(7, "O", "1995-07-16")
                        .row(32, "O", "1998-07-21")
                        .row(34, "O", null)
                        .build());
        assertWindowQueryWithNulls("lead(orderdate) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, BIGINT, VARCHAR, VARCHAR)
                        .row(3L, "F", null)
                        .row(5L, "F", "1992-02-21")
                        .row(6L, "F", "1993-10-27")
                        .row(null, "F", null)
                        .row(34L, "O", "1996-12-01")
                        .row(null, "O", null)
                        .row(1L, null, "1996-01-10")
                        .row(7L, null, null)
                        .row(null, null, "1995-07-16")
                        .row(null, null, null)
                        .build());

        assertWindowQuery("lead(orderkey) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, BIGINT)
                        .row(3, "F", 5)
                        .row(5, "F", 6)
                        .row(6, "F", 33)
                        .row(33, "F", null)
                        .row(1, "O", 2)
                        .row(2, "O", 4)
                        .row(4, "O", 7)
                        .row(7, "O", 32)
                        .row(32, "O", 34)
                        .row(34, "O", null)
                        .build());
        assertWindowQueryWithNulls("lead(orderkey) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, BIGINT, VARCHAR, BIGINT)
                        .row(3L, "F", 5L)
                        .row(5L, "F", 6L)
                        .row(6L, "F", null)
                        .row(null, "F", null)
                        .row(34L, "O", null)
                        .row(null, "O", null)
                        .row(1L, null, 7L)
                        .row(7L, null, null)
                        .row(null, null, null)
                        .row(null, null, null)
                        .build());

        assertWindowQuery("lead(orderdate, 2, '1977-01-01') OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, VARCHAR)
                        .row(3, "F", "1992-02-21")
                        .row(5, "F", "1993-10-27")
                        .row(6, "F", "1977-01-01")
                        .row(33, "F", "1977-01-01")
                        .row(1, "O", "1995-10-11")
                        .row(2, "O", "1996-01-10")
                        .row(4, "O", "1995-07-16")
                        .row(7, "O", "1998-07-21")
                        .row(32, "O", "1977-01-01")
                        .row(34, "O", "1977-01-01")
                        .build());
        assertWindowQueryWithNulls("lead(orderdate, 2, '1977-01-01') OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, BIGINT, VARCHAR, VARCHAR)
                        .row(3L, "F", "1992-02-21")
                        .row(5L, "F", "1993-10-27")
                        .row(6L, "F", "1977-01-01")
                        .row(null, "F", "1977-01-01")
                        .row(34L, "O", "1977-01-01")
                        .row(null, "O", "1977-01-01")
                        .row(1L, null, null)
                        .row(7L, null, "1995-07-16")
                        .row(null, null, "1977-01-01")
                        .row(null, null, "1977-01-01")
                        .build());

        assertWindowQuery("lead(orderkey, 2, -1) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, INTEGER)
                        .row(3, "F", 6)
                        .row(5, "F", 33)
                        .row(6, "F", -1)
                        .row(33, "F", -1)
                        .row(1, "O", 4)
                        .row(2, "O", 7)
                        .row(4, "O", 32)
                        .row(7, "O", 34)
                        .row(32, "O", -1)
                        .row(34, "O", -1)
                        .build());

        assertWindowQueryWithNulls("lead(orderkey, 2, -1) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, BIGINT, VARCHAR, BIGINT)
                        .row(3L, "F", 6L)
                        .row(5L, "F", null)
                        .row(6L, "F", -1L)
                        .row(null, "F", -1L)
                        .row(34L, "O", -1L)
                        .row(null, "O", -1L)
                        .row(1L, null, null)
                        .row(7L, null, null)
                        .row(null, null, -1L)
                        .row(null, null, -1L)
                        .build());

        assertWindowQuery("lead(orderkey, 8 * 1000 * 1000) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, INTEGER)
                        .row(3, "F", null)
                        .row(5, "F", null)
                        .row(6, "F", null)
                        .row(33, "F", null)
                        .row(1, "O", null)
                        .row(2, "O", null)
                        .row(4, "O", null)
                        .row(7, "O", null)
                        .row(32, "O", null)
                        .row(34, "O", null)
                        .build());

        assertWindowQuery("lead(orderkey, null, -1) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, INTEGER)
                        .row(3, "F", null)
                        .row(5, "F", null)
                        .row(6, "F", null)
                        .row(33, "F", null)
                        .row(1, "O", null)
                        .row(2, "O", null)
                        .row(4, "O", null)
                        .row(7, "O", null)
                        .row(32, "O", null)
                        .row(34, "O", null)
                        .build());

        assertWindowQuery("lead(orderkey, 0) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, INTEGER)
                        .row(3, "F", 3)
                        .row(5, "F", 5)
                        .row(6, "F", 6)
                        .row(33, "F", 33)
                        .row(1, "O", 1)
                        .row(2, "O", 2)
                        .row(4, "O", 4)
                        .row(7, "O", 7)
                        .row(32, "O", 32)
                        .row(34, "O", 34)
                        .build());

        assertWindowQuery("date_format(lead(cast(orderdate as TIMESTAMP), 0) OVER (PARTITION BY orderstatus ORDER BY orderkey), '%Y-%m-%d')",
                resultBuilder(TEST_SESSION, INTEGER, VARCHAR, VARCHAR)
                        .row(3, "F", "1993-10-14")
                        .row(5, "F", "1994-07-30")
                        .row(6, "F", "1992-02-21")
                        .row(33, "F", "1993-10-27")
                        .row(1, "O", "1996-01-02")
                        .row(2, "O", "1996-12-01")
                        .row(4, "O", "1995-10-11")
                        .row(7, "O", "1996-01-10")
                        .row(32, "O", "1995-07-16")
                        .row(34, "O", "1998-07-21")
                        .build());
    }