/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.operator.window;
import org.testng.annotations.Test;
import static com.facebook.presto.SessionTestUtils.TEST_SESSION;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.IntegerType.INTEGER;
import static com.facebook.presto.spi.type.VarcharType.VARCHAR;
import static com.facebook.presto.testing.MaterializedResult.resultBuilder;
public class TestLagFunction
extends AbstractTestWindowFunction
{
@Test
public void testLagFunction()
{
assertWindowQuery("lag(orderdate) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, INTEGER, VARCHAR, VARCHAR)
.row(3, "F", null)
.row(5, "F", "1993-10-14")
.row(6, "F", "1994-07-30")
.row(33, "F", "1992-02-21")
.row(1, "O", null)
.row(2, "O", "1996-01-02")
.row(4, "O", "1996-12-01")
.row(7, "O", "1995-10-11")
.row(32, "O", "1996-01-10")
.row(34, "O", "1995-07-16")
.build());
assertWindowQueryWithNulls("lag(orderdate) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, BIGINT, VARCHAR, VARCHAR)
.row(3L, "F", null)
.row(5L, "F", "1993-10-14")
.row(6L, "F", null)
.row(null, "F", "1992-02-21")
.row(34L, "O", null)
.row(null, "O", "1998-07-21")
.row(1L, null, null)
.row(7L, null, null)
.row(null, null, "1996-01-10")
.row(null, null, null)
.build());
assertWindowQuery("lag(orderkey) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, INTEGER, VARCHAR, INTEGER)
.row(3, "F", null)
.row(5, "F", 3)
.row(6, "F", 5)
.row(33, "F", 6)
.row(1, "O", null)
.row(2, "O", 1)
.row(4, "O", 2)
.row(7, "O", 4)
.row(32, "O", 7)
.row(34, "O", 32)
.build());
assertWindowQueryWithNulls("lag(orderkey) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, BIGINT, VARCHAR, BIGINT)
.row(3L, "F", null)
.row(5L, "F", 3L)
.row(6L, "F", 5L)
.row(null, "F", 6L)
.row(34L, "O", null)
.row(null, "O", 34L)
.row(1L, null, null)
.row(7L, null, 1L)
.row(null, null, 7L)
.row(null, null, null)
.build());
assertWindowQuery("lag(orderdate, 2, '1977-01-01') OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, INTEGER, VARCHAR, VARCHAR)
.row(3, "F", "1977-01-01")
.row(5, "F", "1977-01-01")
.row(6, "F", "1993-10-14")
.row(33, "F", "1994-07-30")
.row(1, "O", "1977-01-01")
.row(2, "O", "1977-01-01")
.row(4, "O", "1996-01-02")
.row(7, "O", "1996-12-01")
.row(32, "O", "1995-10-11")
.row(34, "O", "1996-01-10")
.build());
assertWindowQueryWithNulls("lag(orderdate, 2, '1977-01-01') OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, BIGINT, VARCHAR, VARCHAR)
.row(3L, "F", "1977-01-01")
.row(5L, "F", "1977-01-01")
.row(6L, "F", "1993-10-14")
.row(null, "F", null)
.row(34L, "O", "1977-01-01")
.row(null, "O", "1977-01-01")
.row(1L, null, "1977-01-01")
.row(7L, null, "1977-01-01")
.row(null, null, null)
.row(null, null, "1996-01-10")
.build());
assertWindowQuery("lag(orderkey, 2, -1) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, INTEGER, VARCHAR, INTEGER)
.row(3, "F", -1)
.row(5, "F", -1)
.row(6, "F", 3)
.row(33, "F", 5)
.row(1, "O", -1)
.row(2, "O", -1)
.row(4, "O", 1)
.row(7, "O", 2)
.row(32, "O", 4)
.row(34, "O", 7)
.build());
assertWindowQueryWithNulls("lag(orderkey, 2, -1) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, BIGINT, VARCHAR, BIGINT)
.row(3L, "F", -1L)
.row(5L, "F", -1L)
.row(6L, "F", 3L)
.row(null, "F", 5L)
.row(34L, "O", -1L)
.row(null, "O", -1L)
.row(1L, null, -1L)
.row(7L, null, -1L)
.row(null, null, 1L)
.row(null, null, 7L)
.build());
assertWindowQuery("lag(orderkey, BIGINT '8' * 1000 * 1000 * 1000) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, INTEGER, VARCHAR, BIGINT)
.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("lag(orderkey, null, -1) OVER (PARTITION BY orderstatus ORDER BY orderkey)",
resultBuilder(TEST_SESSION, INTEGER, VARCHAR, BIGINT)
.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("lag(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(lag(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());
}
}