/*
* 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.scalar;
import com.facebook.presto.type.ArrayType;
import org.testng.annotations.Test;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.DoubleType.DOUBLE;
import static com.facebook.presto.spi.type.IntegerType.INTEGER;
import static com.facebook.presto.spi.type.TimeZoneKey.getTimeZoneKey;
import static com.facebook.presto.testing.TestingSession.testSessionBuilder;
import static java.util.Arrays.asList;
public class TestArrayReduceFunction
extends AbstractTestFunctions
{
public TestArrayReduceFunction()
{
super(testSessionBuilder().setTimeZoneKey(getTimeZoneKey("Pacific/Kiritimati")).build());
}
@Test
public void testEmpty()
throws Exception
{
assertFunction("reduce(ARRAY [], CAST (0 AS BIGINT), (s, x) -> s + x, s -> s)", BIGINT, 0L);
}
@Test
public void testBasic()
throws Exception
{
assertFunction("reduce(ARRAY [5, 20, 50], CAST (0 AS BIGINT), (s, x) -> s + x, s -> s)", BIGINT, 75L);
assertFunction("reduce(ARRAY [5 + RANDOM(1), 20, 50], CAST (0 AS BIGINT), (s, x) -> s + x, s -> s)", BIGINT, 75L);
assertFunction("reduce(ARRAY [5, 6, 10, 20], 0.0, (s, x) -> s + x, s -> s)", DOUBLE, 41.0);
}
@Test
public void testNulls()
throws Exception
{
assertFunction("reduce(ARRAY [NULL], CAST (0 AS BIGINT), (s, x) -> s + x, s -> s)", BIGINT, null);
assertFunction("reduce(ARRAY [NULL, NULL, NULL], CAST (0 AS BIGINT), (s, x) -> coalesce(x, 1) + s, s -> s)", BIGINT, 3L);
assertFunction("reduce(ARRAY [5, NULL, 50], CAST (0 AS BIGINT), (s, x) -> s + x, s -> s)", BIGINT, null);
assertFunction("reduce(ARRAY [5, NULL, 50], CAST (0 AS BIGINT), (s, x) -> coalesce(x, 0) + s, s -> s)", BIGINT, 55L);
// mimics max function
assertFunction("reduce(ARRAY [], CAST (NULL AS BIGINT), (s, x) -> IF(s IS NULL OR x > s, x, s), s -> s)", BIGINT, null);
assertFunction("reduce(ARRAY [NULL], CAST (NULL AS BIGINT), (s, x) -> IF(s IS NULL OR x > s, x, s), s -> s)", BIGINT, null);
assertFunction("reduce(ARRAY [NULL, NULL, NULL], CAST (NULL AS BIGINT), (s, x) -> IF(s IS NULL OR x > s, x, s), s -> s)", BIGINT, null);
assertFunction("reduce(ARRAY [NULL, 6, 10, NULL, 8], CAST (NULL AS BIGINT), (s, x) -> IF(s IS NULL OR x > s, x, s), s -> s)", BIGINT, 10L);
assertFunction("reduce(ARRAY [5, NULL, 6, 10, NULL, 8], CAST (NULL AS BIGINT), (s, x) -> IF(s IS NULL OR x > s, x, s), s -> s)", BIGINT, 10L);
}
@Test
public void testTwoValueState()
throws Exception
{
assertFunction(
"reduce(" +
"ARRAY [5, 20, 50], " +
"CAST(ROW(0, 0) AS ROW(sum BIGINT, count INTEGER)), " +
"(s, x) -> CAST(ROW(x + s.sum, s.count + 1) AS ROW(sum BIGINT, count INTEGER)), " +
"s -> s.sum / s.count)",
BIGINT,
25L);
assertFunction(
"reduce(" +
"ARRAY [5, 6, 10, 20], " +
"CAST(ROW(0.0, 0) AS ROW(sum DOUBLE, count INTEGER)), " +
"(s, x) -> CAST(ROW(x + s.sum, s.count + 1) AS ROW(sum DOUBLE, count INTEGER)), " +
"s -> s.sum / s.count)",
DOUBLE,
10.25);
}
@Test
public void testInstanceFunction()
{
assertFunction(
"reduce(ARRAY[ARRAY[1, 2], ARRAY[3, 4], ARRAY[5, NULL, 7]], CAST(ARRAY[] AS ARRAY(INTEGER)), (s, x) -> concat(s, x), s -> s)",
new ArrayType(INTEGER),
asList(1, 2, 3, 4, 5, null, 7));
}
}