44 lines
1.5 KiB
C++
44 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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#include "udf_sample.h"
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namespace doris_udf {
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// ---------------------------------------------------------------------------
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// This is a sample of implementing a COUNT aggregate function.
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// ---------------------------------------------------------------------------
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void CountInit(FunctionContext* context, BigIntVal* val) {
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val->is_null = false;
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val->val = 0;
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}
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void CountUpdate(FunctionContext* context, const IntVal& input, BigIntVal* val) {
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if (input.is_null) return;
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++val->val;
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}
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void CountMerge(FunctionContext* context, const BigIntVal& src, BigIntVal* dst) {
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dst->val += src.val;
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}
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BigIntVal CountFinalize(FunctionContext* context, const BigIntVal& val) {
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return val;
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}
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}
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