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https://github.com/ClickHouse/ClickHouse.git
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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
#include <sstream>
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#include <Storages/IStorage.h>
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#include <Parsers/TablePropertiesQueriesASTs.h>
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#include <Parsers/formatAST.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <DataStreams/BlockIO.h>
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#include <DataStreams/copyData.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeString.h>
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#include <Columns/ColumnString.h>
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#include <Common/typeid_cast.h>
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#include <Access/AccessFlags.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/InterpreterShowCreateQuery.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 SYNTAX_ERROR;
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extern const int THERE_IS_NO_QUERY;
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}
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BlockIO InterpreterShowCreateQuery::execute()
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{
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BlockIO res;
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res.in = executeImpl();
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return res;
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}
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Block InterpreterShowCreateQuery::getSampleBlock()
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{
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return Block{{
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ColumnString::create(),
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std::make_shared<DataTypeString>(),
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"statement"}};
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}
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BlockInputStreamPtr InterpreterShowCreateQuery::executeImpl()
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{
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ASTPtr create_query;
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ASTQueryWithTableAndOutput * show_query;
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if ((show_query = query_ptr->as<ASTShowCreateTableQuery>()))
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{
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auto resolve_table_type = show_query->temporary ? Context::ResolveExternal : Context::ResolveOrdinary;
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auto table_id = context.resolveStorageID(*show_query, resolve_table_type);
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context.checkAccess(AccessType::SHOW_COLUMNS, table_id);
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create_query = DatabaseCatalog::instance().getDatabase(table_id.database_name)->getCreateTableQuery(context, table_id.table_name);
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}
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else if ((show_query = query_ptr->as<ASTShowCreateDatabaseQuery>()))
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{
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if (show_query->temporary)
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throw Exception("Temporary databases are not possible.", ErrorCodes::SYNTAX_ERROR);
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show_query->database = context.resolveDatabase(show_query->database);
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context.checkAccess(AccessType::SHOW_DATABASES, show_query->database);
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create_query = DatabaseCatalog::instance().getDatabase(show_query->database)->getCreateDatabaseQuery(context);
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}
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else if ((show_query = query_ptr->as<ASTShowCreateDictionaryQuery>()))
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{
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if (show_query->temporary)
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throw Exception("Temporary dictionaries are not possible.", ErrorCodes::SYNTAX_ERROR);
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show_query->database = context.resolveDatabase(show_query->database);
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context.checkAccess(AccessType::SHOW_DICTIONARIES, show_query->database, show_query->table);
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create_query = DatabaseCatalog::instance().getDatabase(show_query->database)->getCreateDictionaryQuery(context, show_query->table);
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}
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if (!create_query && show_query && show_query->temporary)
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throw Exception("Unable to show the create query of " + show_query->table + ". Maybe it was created by the system.", ErrorCodes::THERE_IS_NO_QUERY);
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std::stringstream stream;
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formatAST(*create_query, stream, false, true);
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String res = stream.str();
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MutableColumnPtr column = ColumnString::create();
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column->insert(res);
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return std::make_shared<OneBlockInputStream>(Block{{
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std::move(column),
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std::make_shared<DataTypeString>(),
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"statement"}});
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}
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}
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