| /** |
| * Copyright 2016, Quickstep Research Group, Computer Sciences Department, |
| * University of Wisconsin—Madison. |
| * |
| * Licensed 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. |
| **/ |
| |
| #ifndef QUICKSTEP_PARSER_PARSE_SAMPLE_HPP_ |
| #define QUICKSTEP_PARSER_PARSE_SAMPLE_HPP_ |
| |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "parser/ParseLiteralValue.hpp" |
| #include "parser/ParseTreeNode.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| /** \addtogroup Parser |
| * @{ |
| */ |
| |
| /** |
| * @brief A parsed representation of block/tuple sample. |
| */ |
| class ParseSample : public ParseTreeNode { |
| public: |
| /** |
| * @brief Constructor. |
| * @note This constructor takes ownership of \c percentage. |
| * |
| * @param line_number The line number of "SAMPLE" in the SQL statement. |
| * @param column_number The column number of "SAMPLE" in the SQL statement. |
| * @param is_block_sample The flag indicating whether this is block sample or tuple sample. |
| * @param percentage The percentage of data to sample. |
| */ |
| ParseSample(const int line_number, |
| const int column_number, |
| const bool is_block_sample, |
| NumericParseLiteralValue *percentage) |
| : ParseTreeNode(line_number, column_number), |
| percentage_(percentage), |
| is_block_sample_(is_block_sample) {} |
| |
| /** |
| * @brief Destructor. |
| */ |
| ~ParseSample() override {} |
| |
| /** |
| * @brief Get the sample percentage. |
| * |
| * @return The sample percentage. |
| */ |
| const NumericParseLiteralValue* percentage() const { |
| return percentage_.get(); |
| } |
| |
| /** |
| * @brief Get the sample type indicating flag. |
| * |
| * @return True if this is a block sample. False if this is a tuple sample. |
| */ |
| bool is_block_sample() const { |
| return is_block_sample_; |
| } |
| |
| std::string getName() const override { |
| return "SAMPLE"; |
| } |
| |
| protected: |
| void getFieldStringItems(std::vector<std::string> *inline_field_names, |
| std::vector<std::string> *inline_field_values, |
| std::vector<std::string> *non_container_child_field_names, |
| std::vector<const ParseTreeNode*> *non_container_child_fields, |
| std::vector<std::string> *container_child_field_names, |
| std::vector<std::vector<const ParseTreeNode*>> *container_child_fields) const override; |
| |
| private: |
| std::unique_ptr<NumericParseLiteralValue> percentage_; |
| const bool is_block_sample_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ParseSample); |
| }; |
| |
| /** @} */ |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_PARSER_PARSE_SAMPLE_HPP_ |