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Add support for map_keys_by_top_n_values
UDF to return the top n keys of a map by sorting its values in the descending order
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124
...rc/test/java/com/facebook/presto/operator/scalar/sql/TestMapKeysByTopNValuesFunction.java
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| /* | ||
| * 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.sql; | ||
|
|
||
| import com.facebook.presto.common.type.ArrayType; | ||
| import com.facebook.presto.common.type.RowType; | ||
| import com.facebook.presto.operator.scalar.AbstractTestFunctions; | ||
| import com.facebook.presto.spi.StandardErrorCode; | ||
| import com.google.common.collect.ImmutableList; | ||
| import org.testng.annotations.Test; | ||
|
|
||
| import static com.facebook.presto.common.type.DecimalType.createDecimalType; | ||
| import static com.facebook.presto.common.type.IntegerType.INTEGER; | ||
| import static com.facebook.presto.common.type.UnknownType.UNKNOWN; | ||
| import static com.facebook.presto.common.type.VarcharType.createVarcharType; | ||
|
|
||
| public class TestMapKeysByTopNValuesFunction | ||
| extends AbstractTestFunctions | ||
| { | ||
| @Test | ||
| public void testBasic() | ||
| { | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[1, 2, 3], ARRAY[4, 5, 6]), 2)", | ||
| new ArrayType(INTEGER), | ||
| ImmutableList.of(3, 2)); | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[-1, -2, -3], ARRAY[4, 5, 6]), 2)", | ||
| new ArrayType(INTEGER), | ||
| ImmutableList.of(-3, -2)); | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY['ab', 'bc', 'cd'], ARRAY['x', 'y', 'z']), 1)", | ||
| new ArrayType(createVarcharType(2)), | ||
| ImmutableList.of("cd")); | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[123.0, 99.5, 1000.99], ARRAY['x', 'y', 'z']), 3)", | ||
| new ArrayType(createDecimalType(6, 2)), | ||
| ImmutableList.of(decimal("1000.99"), decimal("99.50"), decimal("123.00"))); | ||
|
|
||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY['abc', 'cbc', 'cbd'], ARRAY[1, 1, 1]), 3)", | ||
| new ArrayType(createVarcharType(3)), | ||
| ImmutableList.of("cbd", "cbc", "abc")); | ||
|
|
||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY['ab', 'bc', 'cd', 'de', 'ee', 'ef', 'ac', 'ad'], ARRAY[1, 2, 2, 2, 4, 5, 5, 6]), 5)", | ||
| new ArrayType(createVarcharType(2)), | ||
| ImmutableList.of("ad", "ef", "ac", "ee", "de")); | ||
| } | ||
|
|
||
| @Test | ||
| public void testNegativeN() | ||
| { | ||
| assertInvalidFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[100, 200, 300], ARRAY[4, 5, 6]), -3)", | ||
| StandardErrorCode.GENERIC_USER_ERROR, | ||
| "n must be greater than or equal to 0"); | ||
| assertInvalidFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[1, 2, 3], ARRAY[4, 5, 6]), -1)", | ||
| StandardErrorCode.GENERIC_USER_ERROR, | ||
| "n must be greater than or equal to 0"); | ||
| assertInvalidFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY['a', 'b', 'c'], ARRAY[4, 5, 6]), -2)", | ||
| StandardErrorCode.GENERIC_USER_ERROR, | ||
| "n must be greater than or equal to 0"); | ||
| } | ||
|
|
||
| @Test | ||
| public void testZeroN() | ||
| { | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[-1, -2, -3], ARRAY[4, 5, 6]), 0)", | ||
| new ArrayType(INTEGER), | ||
| ImmutableList.of()); | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY['ab', 'bc', 'cd'], ARRAY['x', 'y', 'z']), 0)", | ||
| new ArrayType(createVarcharType(2)), | ||
| ImmutableList.of()); | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[123.0, 99.5, 1000.99], ARRAY['x', 'y', 'z']), 0)", | ||
| new ArrayType(createDecimalType(6, 2)), | ||
| ImmutableList.of()); | ||
| } | ||
|
|
||
| @Test | ||
| public void testEmpty() | ||
| { | ||
| assertFunction("MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[], ARRAY[]), 5)", new ArrayType(UNKNOWN), ImmutableList.of()); | ||
| } | ||
|
|
||
| @Test | ||
| public void testNull() | ||
| { | ||
| assertFunction("MAP_KEYS_BY_TOP_N_VALUES(NULL, 1)", new ArrayType(UNKNOWN), null); | ||
| } | ||
|
|
||
| @Test | ||
| public void testComplexKeys() | ||
| { | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[ROW('x', 1), ROW('y', 2)], ARRAY[1, 2]), 1)", | ||
| new ArrayType(RowType.from(ImmutableList.of(RowType.field(createVarcharType(1)), RowType.field(INTEGER)))), | ||
| ImmutableList.of(ImmutableList.of("y", 2))); | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[ROW('x', 1), ROW('x', -2)], ARRAY[2, 1]), 1)", | ||
| new ArrayType(RowType.from(ImmutableList.of(RowType.field(createVarcharType(1)), RowType.field(INTEGER)))), | ||
| ImmutableList.of(ImmutableList.of("x", 1))); | ||
| assertFunction( | ||
| "MAP_KEYS_BY_TOP_N_VALUES(MAP(ARRAY[ROW('x', 1), ROW('x', -2), ROW('y', 1)], ARRAY[100, 200, null]), 3)", | ||
| new ArrayType(RowType.from(ImmutableList.of(RowType.field(createVarcharType(1)), RowType.field(INTEGER)))), | ||
| ImmutableList.of(ImmutableList.of("x", -2), ImmutableList.of("x", 1), ImmutableList.of("y", 1))); | ||
| } | ||
| } |