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154 changes: 154 additions & 0 deletions
154
cpp-ch/local-engine/Parser/scalar_function_parser/arrayHighOrderFunctions.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. | ||
| */ | ||
|
|
||
| #include <Parser/FunctionParser.h> | ||
| #include <Common/Exception.h> | ||
| #include <Poco/Logger.h> | ||
| #include <Common/logger_useful.h> | ||
| #include <Common/CHUtil.h> | ||
| #include <DataTypes/DataTypeFunction.h> | ||
| #include <DataTypes/DataTypeNullable.h> | ||
| #include <Core/Types.h> | ||
| #include <Parser/TypeParser.h> | ||
| #include <Parser/scalar_function_parser/lambdaFunction.h> | ||
|
|
||
| namespace DB::ErrorCodes | ||
| { | ||
| extern const int LOGICAL_ERROR; | ||
| } | ||
|
|
||
| namespace local_engine | ||
| { | ||
| class ArrayFilter : public FunctionParser | ||
| { | ||
| public: | ||
| static constexpr auto name = "filter"; | ||
| explicit ArrayFilter(SerializedPlanParser * plan_parser_) : FunctionParser(plan_parser_) {} | ||
| ~ArrayFilter() override = default; | ||
|
|
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| String getName() const override { return name; } | ||
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| String getCHFunctionName(const substrait::Expression_ScalarFunction & scalar_function) const override | ||
| { | ||
| return "arrayFilter"; | ||
| } | ||
|
|
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| const DB::ActionsDAG::Node * parse(const substrait::Expression_ScalarFunction & substrait_func, | ||
| DB::ActionsDAGPtr & actions_dag) const | ||
| { | ||
| auto ch_func_name = getCHFunctionName(substrait_func); | ||
| auto parsed_args = parseFunctionArguments(substrait_func, ch_func_name, actions_dag); | ||
| assert(parsed_args.size() == 2); | ||
| if (collectLambdaArguments(*plan_parser, substrait_func.arguments()[1].value().scalar_function()).size() == 1) | ||
| return toFunctionNode(actions_dag, ch_func_name, {parsed_args[1], parsed_args[0]}); | ||
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| /// filter with index argument. | ||
| const auto * range_end_node = toFunctionNode(actions_dag, "length", {toFunctionNode(actions_dag, "assumeNotNull", {parsed_args[0]})}); | ||
| range_end_node = ActionsDAGUtil::convertNodeType( | ||
| actions_dag, range_end_node, "Nullable(Int32)", range_end_node->result_name); | ||
| const auto * index_array_node = toFunctionNode( | ||
| actions_dag, | ||
| "range", | ||
| {addColumnToActionsDAG(actions_dag, std::make_shared<DataTypeInt32>(), 0), range_end_node}); | ||
| return toFunctionNode(actions_dag, ch_func_name, {parsed_args[1], parsed_args[0], index_array_node}); | ||
| } | ||
| }; | ||
| static FunctionParserRegister<ArrayFilter> register_array_filter; | ||
|
|
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| class ArrayTransform : public FunctionParser | ||
| { | ||
| public: | ||
| static constexpr auto name = "transform"; | ||
| explicit ArrayTransform(SerializedPlanParser * plan_parser_) : FunctionParser(plan_parser_) {} | ||
| ~ArrayTransform() override = default; | ||
| String getName() const override { return name; } | ||
| String getCHFunctionName(const substrait::Expression_ScalarFunction & scalar_function) const override | ||
| { | ||
| return "arrayMap"; | ||
| } | ||
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| const DB::ActionsDAG::Node * parse(const substrait::Expression_ScalarFunction & substrait_func, | ||
| DB::ActionsDAGPtr & actions_dag) const | ||
| { | ||
| auto ch_func_name = getCHFunctionName(substrait_func); | ||
| auto lambda_args = collectLambdaArguments(*plan_parser, substrait_func.arguments()[1].value().scalar_function()); | ||
| auto parsed_args = parseFunctionArguments(substrait_func, ch_func_name, actions_dag); | ||
| assert(parsed_args.size() == 2); | ||
| if (lambda_args.size() == 1) | ||
| { | ||
| return toFunctionNode(actions_dag, ch_func_name, {parsed_args[1], parsed_args[0]}); | ||
| } | ||
|
|
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| /// transform with index argument. | ||
| const auto * range_end_node = toFunctionNode(actions_dag, "length", {toFunctionNode(actions_dag, "assumeNotNull", {parsed_args[0]})}); | ||
| range_end_node = ActionsDAGUtil::convertNodeType( | ||
| actions_dag, range_end_node, "Nullable(Int32)", range_end_node->result_name); | ||
| const auto * index_array_node = toFunctionNode( | ||
| actions_dag, | ||
| "range", | ||
| {addColumnToActionsDAG(actions_dag, std::make_shared<DataTypeInt32>(), 0), range_end_node}); | ||
| return toFunctionNode(actions_dag, ch_func_name, {parsed_args[1], parsed_args[0], index_array_node}); | ||
| } | ||
| }; | ||
| static FunctionParserRegister<ArrayTransform> register_array_map; | ||
|
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| class ArrayAggregate : public FunctionParser | ||
| { | ||
| public: | ||
| static constexpr auto name = "aggregate"; | ||
| explicit ArrayAggregate(SerializedPlanParser * plan_parser_) : FunctionParser(plan_parser_) {} | ||
| ~ArrayAggregate() override = default; | ||
| String getName() const override { return name; } | ||
| String getCHFunctionName(const substrait::Expression_ScalarFunction & scalar_function) const override | ||
| { | ||
| return "arrayFold"; | ||
| } | ||
| const DB::ActionsDAG::Node * parse(const substrait::Expression_ScalarFunction & substrait_func, | ||
| DB::ActionsDAGPtr & actions_dag) const | ||
| { | ||
| auto ch_func_name = getCHFunctionName(substrait_func); | ||
| auto parsed_args = parseFunctionArguments(substrait_func, ch_func_name, actions_dag); | ||
| assert(parsed_args.size() == 3); | ||
| const auto * function_type = typeid_cast<const DataTypeFunction *>(parsed_args[2]->result_type.get()); | ||
| if (!function_type) | ||
| throw DB::Exception(DB::ErrorCodes::LOGICAL_ERROR, "The third argument of aggregate function must be a lambda function"); | ||
| if (!parsed_args[1]->result_type->equals(*(function_type->getReturnType()))) | ||
| { | ||
| parsed_args[1] = ActionsDAGUtil::convertNodeType( | ||
| actions_dag, | ||
| parsed_args[1], | ||
| function_type->getReturnType()->getName(), | ||
| parsed_args[1]->result_name); | ||
| } | ||
|
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| /// arrayFold cannot accept nullable(array) | ||
| const auto * array_col_node = parsed_args[0]; | ||
| if (parsed_args[0]->result_type->isNullable()) | ||
| { | ||
| array_col_node = toFunctionNode(actions_dag, "assumeNotNull", {parsed_args[0]}); | ||
| } | ||
| const auto * func_node = toFunctionNode(actions_dag, ch_func_name, {parsed_args[2], array_col_node, parsed_args[1]}); | ||
| /// For null array, result is null. | ||
| /// TODO: make a new version of arrayFold that can handle nullable array. | ||
| const auto * is_null_node = toFunctionNode(actions_dag, "isNull", {parsed_args[0]}); | ||
| const auto * null_node = addColumnToActionsDAG(actions_dag, DB::makeNullable(func_node->result_type), DB::Null()); | ||
| return toFunctionNode(actions_dag, "if", {is_null_node, null_node, func_node}); | ||
| } | ||
| }; | ||
| static FunctionParserRegister<ArrayAggregate> register_array_aggregate; | ||
|
|
||
| } |
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