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81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
#include <DB/Parsers/parseQuery.h>
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#include <DB/Parsers/ParserCreateQuery.h>
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#include <DB/Parsers/ASTCreateQuery.h>
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#include <DB/Parsers/formatAST.h>
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#include <DB/Interpreters/InterpreterCreateQuery.h>
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#include <DB/Storages/StorageFactory.h>
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#include <DB/Databases/DatabasesCommon.h>
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namespace DB
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{
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String getTableDefinitionFromCreateQuery(const ASTPtr & query)
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{
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ASTPtr query_clone = query->clone();
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ASTCreateQuery & create = typeid_cast<ASTCreateQuery &>(*query_clone.get());
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/// Удаляем из запроса всё, что не нужно для ATTACH.
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create.attach = true;
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create.database.clear();
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create.as_database.clear();
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create.as_table.clear();
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create.if_not_exists = false;
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create.is_populate = false;
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String engine = typeid_cast<ASTFunction &>(*create.storage).name;
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/// Для engine VIEW необходимо сохранить сам селект запрос, для остальных - наоборот
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if (engine != "View" && engine != "MaterializedView")
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create.select = nullptr;
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std::ostringstream statement_stream;
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formatAST(create, statement_stream, 0, false);
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statement_stream << '\n';
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return statement_stream.str();
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}
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std::pair<String, StoragePtr> createTableFromDefinition(
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const String & definition,
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const String & database_name,
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const String & database_data_path,
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Context & context,
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const String & description_for_error_message)
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{
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ParserCreateQuery parser;
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ASTPtr ast = parseQuery(parser, definition.data(), definition.data() + definition.size(), description_for_error_message);
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ASTCreateQuery & ast_create_query = typeid_cast<ASTCreateQuery &>(*ast);
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ast_create_query.attach = true;
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ast_create_query.database = database_name;
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/// Не используем напрямую InterpreterCreateQuery::execute, так как:
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/// - база данных ещё не создана;
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/// - код проще, так как запрос уже приведён к подходящему виду.
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InterpreterCreateQuery::ColumnsInfo columns_info = InterpreterCreateQuery::getColumnsInfo(ast_create_query.columns, context);
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String storage_name;
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if (ast_create_query.is_view)
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storage_name = "View";
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else if (ast_create_query.is_materialized_view)
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storage_name = "MaterializedView";
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else
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storage_name = typeid_cast<ASTFunction &>(*ast_create_query.storage).name;
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return
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{
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ast_create_query.table,
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StorageFactory::instance().get(
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storage_name, database_data_path, ast_create_query.table, database_name, context,
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context.getGlobalContext(), ast, columns_info.columns,
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columns_info.materialized_columns, columns_info.alias_columns, columns_info.column_defaults,
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true)
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};
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}
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}
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