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cpp-ch/local-engine/AggregateFunctions/WindowGroupLimitFunctions.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 <exception> | ||
| #include <AggregateFunctions/AggregateFunctionFactory.h> | ||
| #include <AggregateFunctions/WindowGroupLimitFunctions.h> | ||
| #include <Columns/ColumnVector.h> | ||
| #include <DataTypes/DataTypesNumber.h> | ||
| #include <Processors/Transforms/WindowTransform.h> | ||
| #include <Poco/Logger.h> | ||
| #include <Common/logger_useful.h> | ||
|
|
||
| namespace DB::ErrorCodes | ||
| { | ||
| extern const int BAD_ARGUMENTS; | ||
| } | ||
|
|
||
| namespace local_engine | ||
| { | ||
| WindowFunctionTopRowNumber::WindowFunctionTopRowNumber(const String name, const DB::DataTypes & arg_types, const DB::Array & parameters_) | ||
| : DB::WindowFunction(name, arg_types, parameters_, std::make_shared<DB::DataTypeUInt64>()) | ||
| { | ||
| if (parameters.size() != 1) | ||
| throw DB::Exception(DB::ErrorCodes::BAD_ARGUMENTS, "{} needs a limit parameter", name); | ||
| limit = parameters[0].safeGet<UInt64>(); | ||
| LOG_ERROR(getLogger("WindowFunctionTopRowNumber"), "xxx {} limit: {}", name, limit); | ||
| } | ||
|
|
||
| void WindowFunctionTopRowNumber::windowInsertResultInto(const DB::WindowTransform * transform, size_t function_index) const | ||
| { | ||
| LOG_ERROR( | ||
| getLogger("WindowFunctionTopRowNumber"), | ||
| "xxx current row number: {}, current_row: {}@{}, partition_ended: {}", | ||
| transform->current_row_number, | ||
| transform->current_row.block, | ||
| transform->current_row.row, | ||
| transform->partition_ended); | ||
| /// If the rank value is larger then limit, and current block only contains rows which are all belong to one partition. | ||
| /// We cant drop this block directly. | ||
| if (!transform->partition_ended && !transform->current_row.row && transform->current_row_number > limit) | ||
| { | ||
| /// It's safe to make it mutable here. but it's still too dangerous, it may be changed in the future and make it unsafe. | ||
| auto * mutable_transform = const_cast<DB::WindowTransform *>(transform); | ||
| DB::WindowTransformBlock & current_block = mutable_transform->blockAt(mutable_transform->current_row); | ||
| current_block.rows = 0; | ||
| auto clear_columns = [](DB::Columns & cols) | ||
| { | ||
| DB::Columns new_cols; | ||
| for (const auto & col : cols) | ||
| { | ||
| new_cols.push_back(std::move(col->cloneEmpty())); | ||
| } | ||
| cols = new_cols; | ||
| }; | ||
| clear_columns(current_block.original_input_columns); | ||
| clear_columns(current_block.input_columns); | ||
| clear_columns(current_block.casted_columns); | ||
| mutable_transform->current_row.block += 1; | ||
| throw DB::Exception(DB::ErrorCodes::LOGICAL_ERROR, "{} is not implemented", name); | ||
| } | ||
| else | ||
| { | ||
| auto & to_col = *transform->blockAt(transform->current_row).output_columns[function_index]; | ||
| assert_cast<DB::ColumnUInt64 &>(to_col).getData().push_back(transform->current_row_number); | ||
| } | ||
| } | ||
|
|
||
| void registerWindowGroupLimitFunctions(DB::AggregateFunctionFactory & factory) | ||
| { | ||
| const DB::AggregateFunctionProperties properties | ||
| = {.returns_default_when_only_null = true, .is_order_dependent = true, .is_window_function = true}; | ||
| factory.registerFunction( | ||
| "top_row_number", | ||
| {[](const String & name, const DB::DataTypes & args_type, const DB::Array & parameters, const DB::Settings *) | ||
| { return std::make_shared<WindowFunctionTopRowNumber>(name, args_type, parameters); }, | ||
| properties}, | ||
| DB::AggregateFunctionFactory::Case::Insensitive); | ||
| } | ||
| } |
33 changes: 33 additions & 0 deletions
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cpp-ch/local-engine/AggregateFunctions/WindowGroupLimitFunctions.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /* | ||
| * 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 <AggregateFunctions/WindowFunction.h> | ||
|
|
||
| namespace local_engine | ||
| { | ||
| class WindowFunctionTopRowNumber : public DB::WindowFunction | ||
| { | ||
| public: | ||
| explicit WindowFunctionTopRowNumber(const String name, const DB::DataTypes & arg_types_, const DB::Array & parameters_); | ||
| ~WindowFunctionTopRowNumber() override = default; | ||
|
|
||
| void windowInsertResultInto(const DB::WindowTransform * transform, size_t function_index) const override; | ||
| bool allocatesMemoryInArena() const override { return false; } | ||
|
|
||
| private: | ||
| size_t limit = 0; | ||
| }; | ||
| } |
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