[GitHub] [doris] carlvinhust2012 commented on a diff in pull request #10388: [feature-wip] (array-type) add the array_distinct function

[GitBox <gi...@apache.org>]

carlvinhust2012 commented on code in PR #10388:
URL: https://github.com/apache/doris/pull/10388#discussion_r905779669


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be/src/vec/functions/array/function_array_distinct.h:
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@@ -0,0 +1,294 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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.
+// This file is copied from
+// https://github.com/ClickHouse/ClickHouse/blob/master/src/Functions/array/arrayDistinct.cpp
+// and modified by Doris
+#pragma once
+
+#include "vec/columns/column_array.h"
+#include "vec/columns/column_const.h"
+#include "vec/common/hash_table/hash_set.h"
+#include "vec/common/hash_table/hash_table.h"
+#include "vec/common/sip_hash.h"
+#include "vec/data_types/data_type_array.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/functions/function.h"
+#include "vec/functions/function_helpers.h"
+#include "vec/io/io_helper.h"
+
+namespace doris::vectorized {
+
+class FunctionArrayDistinct : public IFunction {
+public:
+    static constexpr auto name = "array_distinct";
+    static FunctionPtr create() { return std::make_shared<FunctionArrayDistinct>(); }
+
+    /// Get function name.
+    String get_name() const override { return name; }
+
+    bool is_variadic() const override { return false; }
+
+    size_t get_number_of_arguments() const override { return 1; }
+
+    DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {
+        DCHECK(is_array(arguments[0]))
+                << "first argument for function: " << name << " should be DataTypeArray";
+        return make_nullable(

Review Comment:
   > 
   
   ok，here not need add make_nullable.



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