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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * 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. | ||
| */ | ||
| #pragma once | ||
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| #include "velox/functions/Macros.h" | ||
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| namespace facebook::velox::functions::sparksql { | ||
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| template <typename T> | ||
| struct RandFunction { | ||
| static constexpr bool is_deterministic = false; | ||
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| std::optional<std::mt19937> generator; | ||
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| FOLLY_ALWAYS_INLINE void call(double& result) { | ||
| result = folly::Random::randDouble01(); | ||
| } | ||
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| FOLLY_ALWAYS_INLINE void callNullable( | ||
| double& result, | ||
| const int32_t* seed, | ||
| const int32_t* partitionIndex) { | ||
| VELOX_USER_CHECK_NOT_NULL(partitionIndex, "partitionIndex cannot be null."); | ||
| if (!generator.has_value()) { | ||
| generator = std::mt19937{}; | ||
| if (seed) { | ||
| generator->seed((uint64_t)*seed + *partitionIndex); | ||
| } else { | ||
| // For null input, 0 plus partitionIndex is the seed, consistent with | ||
| // Spark. | ||
| generator->seed(*partitionIndex); | ||
| } | ||
| } | ||
| result = folly::Random::randDouble01(*generator); | ||
| } | ||
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| /// To differentiate generator for each thread, seed plus partitionIndex is | ||
| /// the actual seed used for generator. | ||
| FOLLY_ALWAYS_INLINE void callNullable( | ||
| double& result, | ||
| const int64_t* seed, | ||
| const int32_t* partitionIndex) { | ||
| VELOX_USER_CHECK_NOT_NULL(partitionIndex, "partitionIndex cannot be null."); | ||
| if (!generator.has_value()) { | ||
| generator = std::mt19937{}; | ||
| if (seed) { | ||
| generator->seed((uint64_t)*seed + *partitionIndex); | ||
| } else { | ||
| // For null input, 0 plus partitionIndex is the seed, consistent with | ||
| // Spark. | ||
| generator->seed(*partitionIndex); | ||
| } | ||
| } | ||
| result = folly::Random::randDouble01(*generator); | ||
| } | ||
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| // For NULL constant input of unknown type. | ||
| FOLLY_ALWAYS_INLINE void callNullable( | ||
| double& result, | ||
| const UnknownValue* seed, | ||
| const int32_t* partitionIndex) { | ||
| VELOX_USER_CHECK_NOT_NULL(partitionIndex, "partitionIndex cannot be null."); | ||
| if (!generator.has_value()) { | ||
| generator = std::mt19937{}; | ||
| // For null input, 0 plus partitionIndex is the seed, consistent with | ||
| // Spark. | ||
| generator->seed(*partitionIndex); | ||
| } | ||
| result = folly::Random::randDouble01(*generator); | ||
| } | ||
| }; | ||
| } // namespace facebook::velox::functions::sparksql |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| /* | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * 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. | ||
| */ | ||
| #include "velox/functions/sparksql/tests/SparkFunctionBaseTest.h" | ||
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| namespace facebook::velox::functions::sparksql::test { | ||
| namespace { | ||
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| class RandTest : public SparkFunctionBaseTest { | ||
| public: | ||
| RandTest() { | ||
| // Allow for parsing literal integers as INTEGER, not BIGINT. | ||
| options_.parseIntegerAsBigint = false; | ||
| } | ||
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| protected: | ||
| std::optional<double> rand(int32_t seed, int32_t partitionIndex = 0) { | ||
| return evaluateOnce<double>( | ||
| fmt::format("rand({}, {})", seed, partitionIndex), | ||
| makeRowVector(ROW({}), 1)); | ||
| } | ||
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| std::optional<double> randWithNullSeed(int32_t partitionIndex = 0) { | ||
| return evaluateOnce<double>( | ||
| fmt::format("rand(NULL, {})", partitionIndex), | ||
| makeRowVector(ROW({}), 1)); | ||
| } | ||
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| std::optional<double> randWithNoSeed() { | ||
| return evaluateOnce<double>("rand()", makeRowVector(ROW({}), 1)); | ||
| } | ||
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| VectorPtr randWithBatchInput(int32_t seed, int32_t partitionIndex = 0) { | ||
| auto exprSet = compileExpression( | ||
| fmt::format("rand({}, {})", seed, partitionIndex), ROW({})); | ||
| return evaluate(*exprSet, makeRowVector(ROW({}), 20)); | ||
| } | ||
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| void checkResult(const std::optional<double>& result) { | ||
| EXPECT_NE(result, std::nullopt); | ||
| EXPECT_GE(result.value(), 0.0); | ||
| EXPECT_LT(result.value(), 1.0); | ||
| } | ||
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| // Check whether two vectors that have same size & type, but not all same | ||
| // values. | ||
| void assertNotEqualVectors(const VectorPtr& left, const VectorPtr& right) { | ||
| ASSERT_EQ(left->size(), right->size()); | ||
| ASSERT_TRUE(left->type()->equivalent(*right->type())); | ||
| for (auto i = 0; i < left->size(); i++) { | ||
| if (!left->equalValueAt(right.get(), i, i)) { | ||
| return; | ||
| } | ||
| } | ||
| FAIL() << "Expect two different vectors are produced."; | ||
| } | ||
| }; | ||
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| TEST_F(RandTest, withSeed) { | ||
| checkResult(rand(0)); | ||
| // With same default partitionIndex used, same seed always produces same | ||
| // result. | ||
| EXPECT_EQ(rand(0), rand(0)); | ||
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| checkResult(rand(1)); | ||
| EXPECT_EQ(rand(1), rand(1)); | ||
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| checkResult(rand(20000)); | ||
| EXPECT_EQ(rand(20000), rand(20000)); | ||
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| // Test with same seed, but different partitionIndex. | ||
| EXPECT_NE(rand(0, 0), rand(0, 1)); | ||
| EXPECT_NE(rand(1000, 0), rand(1000, 1)); | ||
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| checkResult(randWithNullSeed()); | ||
| // Null as seed is identical to 0 as seed. | ||
| EXPECT_EQ(randWithNullSeed(), rand(0)); | ||
| // Same null as seed but different partition index. | ||
| EXPECT_NE(randWithNullSeed(0), randWithNullSeed(1)); | ||
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| // Test with batch input. | ||
| auto batchResult1 = randWithBatchInput(100); | ||
| auto batchResult2 = randWithBatchInput(100); | ||
| // Same seed & partition index produce same results. | ||
| velox::test::assertEqualVectors(batchResult1, batchResult2); | ||
| batchResult1 = randWithBatchInput(100, 0 /*partitionIndex*/); | ||
| batchResult2 = randWithBatchInput(100, 1 /*partitionIndex*/); | ||
| // Same seed but different partition index cannot produce absolutely same | ||
| // result. | ||
| assertNotEqualVectors(batchResult1, batchResult2); | ||
| } | ||
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| TEST_F(RandTest, withoutSeed) { | ||
| auto result1 = randWithNoSeed(); | ||
| auto result2 = randWithNoSeed(); | ||
| auto result3 = randWithNoSeed(); | ||
| checkResult(result1); | ||
| checkResult(result2); | ||
| checkResult(result3); | ||
| // It is impossible to get three same results by three separate callings. | ||
| EXPECT_FALSE( | ||
| (result1.value() == result2.value()) && | ||
| (result1.value() == result3.value())); | ||
| } | ||
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| } // namespace | ||
| } // namespace facebook::velox::functions::sparksql::test |