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cpp-ch/local-engine/Parser/scalar_function_parser/expm1.cpp
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/* | ||
* 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. | ||
*/ | ||
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#include <Parser/FunctionParser.h> | ||
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namespace DB | ||
{ | ||
namespace ErrorCodes | ||
{ | ||
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH; | ||
} | ||
} | ||
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namespace local_engine | ||
{ | ||
class FunctionParserExpm1 : public FunctionParser | ||
{ | ||
public: | ||
explicit FunctionParserExpm1(SerializedPlanParser * plan_parser_) : FunctionParser(plan_parser_) {} | ||
~FunctionParserExpm1() override = default; | ||
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static constexpr auto name = "expm1"; | ||
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String getName() const override { return name; } | ||
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const ActionsDAG::Node * parse( | ||
const substrait::Expression_ScalarFunction & substrait_func, | ||
ActionsDAGPtr & actions_dag) const override | ||
{ | ||
/// parse expm1(x) as exp(x) - 1 | ||
auto parsed_args = parseFunctionArguments(substrait_func, "", actions_dag); | ||
if (parsed_args.size() != 1) | ||
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} requires exactly one arguments", getName()); | ||
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const auto * x_node = parsed_args[0]; | ||
const auto * exp_node = toFunctionNode(actions_dag, "exp", {x_node}); | ||
const auto * one_const_node = addColumnToActionsDAG(actions_dag, std::make_shared<DataTypeFloat64>(), 1.0); | ||
const auto * result_node = toFunctionNode(actions_dag, "minus", {exp_node, one_const_node}); | ||
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return convertNodeTypeIfNeeded(substrait_func, result_node, actions_dag); | ||
} | ||
}; | ||
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static FunctionParserRegister<FunctionParserExpm1> register_expm1; | ||
} |
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