OmniSciDB  04ee39c94c
WindowExpressionRewrite.h
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1 /*
2  * Copyright 2019 OmniSci, Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include "../Analyzer/Analyzer.h"
20 
21 // Sum window function come from Calcite with a redundant case expression. We don't
22 // support complex expressions involving window functions, rewrite to just a sum.
23 std::shared_ptr<Analyzer::WindowFunction> rewrite_sum_window(const Analyzer::Expr* expr);
24 
25 // Same as above, but for average. Additionally, replace the sum divided by count
26 // expression with an explicit average.
27 std::shared_ptr<Analyzer::WindowFunction> rewrite_avg_window(const Analyzer::Expr* expr);
std::shared_ptr< Analyzer::WindowFunction > rewrite_avg_window(const Analyzer::Expr *expr)
std::shared_ptr< Analyzer::WindowFunction > rewrite_sum_window(const Analyzer::Expr *expr)