45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include "udf/udf.h"
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namespace doris {
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class TopNFunctions {
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public:
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static void init();
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static void topn_init(FunctionContext*, StringVal* dst);
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template <typename T>
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static void topn_update(FunctionContext*, const T& src, const IntVal& topn, StringVal* dst);
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template <typename T>
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static void topn_update(FunctionContext*, const T& src, const IntVal& topn,
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const IntVal& space_expand_rate, StringVal* dst);
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static void topn_merge(FunctionContext*, const StringVal& src, StringVal* dst);
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static StringVal topn_serialize(FunctionContext* ctx, const StringVal& src);
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static StringVal topn_finalize(FunctionContext*, const StringVal& src);
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};
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} // namespace doris
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