Add rand function for seed in int64 type (#78)

* Initial commit * Add int64 seed support * Add unit test cases
oap-project · Feb 28, 2022 · 8dfaa7a · 8dfaa7a
1 parent 5f86d70
commit 8dfaa7a
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Showing 6 changed files with 53 additions and 3 deletions.
diff --git a/cpp/src/gandiva/function_registry_math_ops.cc b/cpp/src/gandiva/function_registry_math_ops.cc
@@ -108,6 +108,9 @@ std::vector<NativeFunction> GetMathOpsFunctionRegistry() {
                      "gdv_fn_random", NativeFunction::kNeedsFunctionHolder),
       NativeFunction("random", {"rand"}, DataTypeVector{int32()}, float64(),
                      kResultNullNever, "gdv_fn_random_with_seed",
+                     NativeFunction::kNeedsFunctionHolder),
+      NativeFunction("random", {"rand"}, DataTypeVector{int64()}, float64(),
+                     kResultNullNever, "gdv_fn_random_with_seed64",
                      NativeFunction::kNeedsFunctionHolder)};
 
   return math_fn_registry_;

diff --git a/cpp/src/gandiva/gdv_function_stubs.cc b/cpp/src/gandiva/gdv_function_stubs.cc
@@ -147,6 +147,12 @@ double gdv_fn_random_with_seed(int64_t ptr, int32_t seed, bool seed_validity) {
   return (*holder)();
 }
 
+double gdv_fn_random_with_seed64(int64_t ptr, int64_t seed, bool seed_validity) {
+  gandiva::RandomGeneratorHolder* holder =
+      reinterpret_cast<gandiva::RandomGeneratorHolder*>(ptr);
+  return (*holder)();
+}
+
 int64_t gdv_fn_to_date_utf8_utf8(int64_t context_ptr, int64_t holder_ptr,
                                  const char* data, int data_len, bool in1_validity,
                                  const char* pattern, int pattern_len, bool in2_validity,
@@ -1512,6 +1518,10 @@ void ExportedStubFunctions::AddMappings(Engine* engine) const {
   engine->AddGlobalMappingForFunc("gdv_fn_random_with_seed", types->double_type(), args,
                                   reinterpret_cast<void*>(gdv_fn_random_with_seed));
 
+  args = {types->i64_type(), types->i64_type(), types->i1_type()};
+  engine->AddGlobalMappingForFunc("gdv_fn_random_with_seed64", types->double_type(), args,
+                                  reinterpret_cast<void*>(gdv_fn_random_with_seed64));
+
   args = {types->i64_type(),     // int64_t context_ptr
           types->i8_ptr_type(),  // const char* data
           types->i32_type()};    // int32_t lenr

diff --git a/cpp/src/gandiva/gdv_function_stubs.h b/cpp/src/gandiva/gdv_function_stubs.h
@@ -98,6 +98,12 @@ bool in_expr_lookup_utf8(int64_t ptr, const char* data, int data_len, bool in_va
 int gdv_fn_time_with_zone(int* time_fields, const char* zone, int zone_len,
                           int64_t* ret_time);
 
+double gdv_fn_random(int64_t ptr);
+
+double gdv_fn_random_with_seed(int64_t ptr, int32_t seed, bool seed_validity);
+
+double gdv_fn_random_with_seed64(int64_t ptr, int64_t seed, bool seed_validity);
+
 GANDIVA_EXPORT
 const char* gdv_fn_base64_encode_binary(int64_t context, const char* in, int32_t in_len,
                                         int32_t* out_len);

diff --git a/cpp/src/gandiva/random_generator_holder.cc b/cpp/src/gandiva/random_generator_holder.cc
@@ -35,11 +35,16 @@ Status RandomGeneratorHolder::Make(const FunctionNode& node,
 
   auto literal_type = literal->return_type()->id();
   ARROW_RETURN_IF(
-      literal_type != arrow::Type::INT32,
-      Status::Invalid("'random' function requires an int32 literal as parameter"));
+      literal_type != arrow::Type::INT32 && literal_type != arrow::Type::INT64,
+      Status::Invalid("'random' function requires an int32/int64 literal as parameter"));
 
-  *holder = std::shared_ptr<RandomGeneratorHolder>(new RandomGeneratorHolder(
+  if (literal_type == arrow::Type::INT32) {
+    *holder = std::shared_ptr<RandomGeneratorHolder>(new RandomGeneratorHolder(
       literal->is_null() ? 0 : arrow::util::get<int32_t>(literal->holder())));
+  } else {
+    *holder = std::shared_ptr<RandomGeneratorHolder>(new RandomGeneratorHolder(
+      literal->is_null() ? 0 : arrow::util::get<int64_t>(literal->holder())));
+  }
   return Status::OK();
 }
 }  // namespace gandiva
diff --git a/cpp/src/gandiva/random_generator_holder.h b/cpp/src/gandiva/random_generator_holder.h
@@ -46,6 +46,11 @@ class GANDIVA_EXPORT RandomGeneratorHolder : public FunctionHolder {
     generator_.seed(static_cast<uint64_t>(seed64));
   }
 
+  explicit RandomGeneratorHolder(int64_t seed64) : distribution_(0, 1) {
+    seed64 = (seed64 ^ 0x00000005DEECE66D) & 0x0000ffffffffffff;
+    generator_.seed(static_cast<uint64_t>(seed64));
+  }
+
   RandomGeneratorHolder() : distribution_(0, 1) {
     generator_.seed(::arrow::internal::GetRandomSeed());
   }

diff --git a/cpp/src/gandiva/random_generator_holder_test.cc b/cpp/src/gandiva/random_generator_holder_test.cc
@@ -85,6 +85,27 @@ TEST_F(TestRandGenHolder, WithValidSeeds) {
   EXPECT_NE(random_1(), random_2());
 }
 
+TEST_F(TestRandGenHolder, WithValidSeedsInLongType) {
+  std::shared_ptr<RandomGeneratorHolder> rand_gen_holder_1;
+  std::shared_ptr<RandomGeneratorHolder> rand_gen_holder_2;
+  std::shared_ptr<RandomGeneratorHolder> rand_gen_holder_3;
+  FunctionNode rand_func_1 = BuildRandWithSeedFunc(100L, false);
+  FunctionNode rand_func_2 = BuildRandWithSeedFunc(1000L, false);
+  FunctionNode rand_func_3 = BuildRandWithSeedFunc(100000L, false);
+  auto status = RandomGeneratorHolder::Make(rand_func_1, &rand_gen_holder_1);
+  EXPECT_EQ(status.ok(), true) << status.message();
+  status = RandomGeneratorHolder::Make(rand_func_2, &rand_gen_holder_2);
+  EXPECT_EQ(status.ok(), true) << status.message();
+  status = RandomGeneratorHolder::Make(rand_func_3, &rand_gen_holder_3);
+  EXPECT_EQ(status.ok(), true) << status.message();
+
+  auto& random_1 = *rand_gen_holder_1;
+  auto& random_2 = *rand_gen_holder_2;
+  auto& random_3 = *rand_gen_holder_3;
+  EXPECT_NE(random_2(), random_3());
+  EXPECT_NE(random_1(), random_2());
+}
+
 TEST_F(TestRandGenHolder, WithInValidSeed) {
   std::shared_ptr<RandomGeneratorHolder> rand_gen_holder_1;
   std::shared_ptr<RandomGeneratorHolder> rand_gen_holder_2;