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100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
#include <TableFunctions/TableFunctionDictionary.h>
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#include <Parsers/ASTLiteral.h>
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#include <Access/Common/AccessFlags.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Interpreters/ExternalDictionariesLoader.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Interpreters/Context.h>
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#include <Storages/StorageDictionary.h>
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#include <Storages/checkAndGetLiteralArgument.h>
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#include <TableFunctions/TableFunctionFactory.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 LOGICAL_ERROR;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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void TableFunctionDictionary::parseArguments(const ASTPtr & ast_function, ContextPtr context)
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{
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// Parse args
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ASTs & args_func = ast_function->children;
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if (args_func.size() != 1)
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Table function ({}) must have arguments.", quoteString(getName()));
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ASTs & args = args_func.at(0)->children;
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if (args.size() != 1)
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throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Table function ({}) requires 1 arguments", quoteString(getName()));
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for (auto & arg : args)
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arg = evaluateConstantExpressionOrIdentifierAsLiteral(arg, context);
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dictionary_name = checkAndGetLiteralArgument<String>(args[0], "dictionary_name");
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}
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ColumnsDescription TableFunctionDictionary::getActualTableStructure(ContextPtr context, bool /*is_insert_query*/) const
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{
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const ExternalDictionariesLoader & external_loader = context->getExternalDictionariesLoader();
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std::string resolved_name = external_loader.resolveDictionaryName(dictionary_name, context->getCurrentDatabase());
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auto load_result = external_loader.load(resolved_name);
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if (load_result)
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{
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/// for regexp tree dictionary, the table structure will be different with dictionary structure. it is:
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/// - id. identifier of the tree node
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/// - parent_id.
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/// - regexp. the regular expression
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/// - keys. the names of attributions of dictionary structure
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/// - values. the values of each attribution
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const auto dictionary = std::static_pointer_cast<const IDictionary>(load_result);
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if (dictionary->getTypeName() == "RegExpTree")
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{
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return ColumnsDescription(NamesAndTypesList({
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{"id", std::make_shared<DataTypeUInt64>()},
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{"parent_id", std::make_shared<DataTypeUInt64>()},
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{"regexp", std::make_shared<DataTypeString>()},
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{"keys", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
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{"values", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())}
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}));
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}
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}
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/// otherwise, we get table structure by dictionary structure.
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auto dictionary_structure = external_loader.getDictionaryStructure(dictionary_name, context);
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return ColumnsDescription(StorageDictionary::getNamesAndTypes(dictionary_structure));
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}
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StoragePtr TableFunctionDictionary::executeImpl(
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const ASTPtr &, ContextPtr context, const std::string & table_name, ColumnsDescription, bool is_insert_query) const
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{
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context->checkAccess(AccessType::dictGet, getDatabaseName(), table_name);
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StorageID dict_id(getDatabaseName(), table_name);
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auto dictionary_table_structure = getActualTableStructure(context, is_insert_query);
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auto result = std::make_shared<StorageDictionary>(
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dict_id, dictionary_name, std::move(dictionary_table_structure), String{}, StorageDictionary::Location::Custom, context);
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return result;
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}
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void registerTableFunctionDictionary(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionDictionary>();
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}
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}
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