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94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
#include <base/defines.h>
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#include <Parsers/ASTExpressionList.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Parsers/ASTStatisticDeclaration.h>
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#include <Parsers/formatAST.h>
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#include <Parsers/parseQuery.h>
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#include <Parsers/ParserCreateQuery.h>
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#include <Poco/Logger.h>
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#include <Storages/extractKeyExpressionList.h>
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#include <Storages/StatisticsDescription.h>
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#include <Storages/ColumnsDescription.h>
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#include <Common/logger_useful.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int INCORRECT_QUERY;
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extern const int LOGICAL_ERROR;
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};
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StatisticType stringToType(String type)
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{
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if (type == "tdigest")
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return TDigest;
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throw Exception(ErrorCodes::INCORRECT_QUERY, "Unknown statistic type: {}. We only support statistic type `tdigest` right now.", type);
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}
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String StatisticDescription::getTypeName() const
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{
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if (type == TDigest)
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return "tdigest";
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throw Exception(ErrorCodes::INCORRECT_QUERY, "Unknown statistic type: {}. We only support statistic type `tdigest` right now.", type);
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}
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std::vector<StatisticDescription> StatisticDescription::getStatisticsFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns)
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{
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const auto * stat_definition = definition_ast->as<ASTStatisticDeclaration>();
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if (!stat_definition)
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Cannot create statistic from non ASTStatisticDeclaration AST");
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std::vector<StatisticDescription> stats;
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stats.reserve(stat_definition->columns->children.size());
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for (const auto & column_ast : stat_definition->columns->children)
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{
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StatisticDescription stat;
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stat.type = stringToType(Poco::toLower(stat_definition->type));
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String column_name = column_ast->as<ASTIdentifier &>().name();
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if (!columns.hasPhysical(column_name))
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throw Exception(ErrorCodes::INCORRECT_QUERY, "Incorrect column name {}", column_name);
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const auto & column = columns.getPhysical(column_name);
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stat.column_name = column.name;
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auto function_node = std::make_shared<ASTFunction>();
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function_node->name = "STATISTIC";
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function_node->arguments = std::make_shared<ASTExpressionList>();
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function_node->arguments->children.push_back(std::make_shared<ASTIdentifier>(stat_definition->type));
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function_node->children.push_back(function_node->arguments);
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stat.ast = function_node;
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stats.push_back(stat);
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}
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if (stats.empty())
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throw Exception(ErrorCodes::INCORRECT_QUERY, "Empty statistic column list");
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return stats;
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}
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String queryToString(const IAST & query);
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StatisticDescription StatisticDescription::getStatisticFromColumnDeclaration(const ASTColumnDeclaration & column)
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{
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const auto & stat_type_list_ast = column.stat_type->as<ASTFunction &>().arguments;
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if (stat_type_list_ast->children.size() != 1)
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throw Exception(ErrorCodes::INCORRECT_QUERY, "We expect only one statistic type for column {}", queryToString(column));
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const auto & stat_type = stat_type_list_ast->children[0]->as<ASTFunction &>().name;
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StatisticDescription stat;
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stat.type = stringToType(Poco::toLower(stat_type));
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stat.column_name = column.name;
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stat.ast = column.stat_type;
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return stat;
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}
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}
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