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124 lines
4.6 KiB
C++
124 lines
4.6 KiB
C++
#include <Interpreters/InterpreterDeleteQuery.h>
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#include <Interpreters/InterpreterFactory.h>
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#include <Access/ContextAccess.h>
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#include <Databases/DatabaseReplicated.h>
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#include <Databases/IDatabase.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/FunctionNameNormalizer.h>
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#include <Interpreters/InterpreterAlterQuery.h>
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#include <Interpreters/MutationsInterpreter.h>
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#include <Parsers/parseQuery.h>
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#include <Parsers/formatAST.h>
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#include <Parsers/ParserAlterQuery.h>
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#include <Parsers/ASTDeleteQuery.h>
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#include <Storages/AlterCommands.h>
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#include <Storages/IStorage.h>
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#include <Storages/MutationCommands.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 TABLE_IS_READ_ONLY;
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extern const int SUPPORT_IS_DISABLED;
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extern const int BAD_ARGUMENTS;
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}
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InterpreterDeleteQuery::InterpreterDeleteQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_)
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{
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}
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BlockIO InterpreterDeleteQuery::execute()
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{
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FunctionNameNormalizer().visit(query_ptr.get());
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const ASTDeleteQuery & delete_query = query_ptr->as<ASTDeleteQuery &>();
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auto table_id = getContext()->resolveStorageID(delete_query, Context::ResolveOrdinary);
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getContext()->checkAccess(AccessType::ALTER_DELETE, table_id);
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query_ptr->as<ASTDeleteQuery &>().setDatabase(table_id.database_name);
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/// First check table storage for validations.
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StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
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checkStorageSupportsTransactionsIfNeeded(table, getContext());
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if (table->isStaticStorage())
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throw Exception(ErrorCodes::TABLE_IS_READ_ONLY, "Table is read-only");
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DatabasePtr database = DatabaseCatalog::instance().getDatabase(table_id.database_name);
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if (database->shouldReplicateQuery(getContext(), query_ptr))
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{
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auto guard = DatabaseCatalog::instance().getDDLGuard(table_id.database_name, table_id.table_name);
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guard->releaseTableLock();
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return database->tryEnqueueReplicatedDDL(query_ptr, getContext());
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}
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auto table_lock = table->lockForShare(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
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auto metadata_snapshot = table->getInMemoryMetadataPtr();
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if (table->supportsDelete())
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{
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/// Convert to MutationCommand
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MutationCommands mutation_commands;
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MutationCommand mut_command;
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mut_command.type = MutationCommand::Type::DELETE;
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mut_command.predicate = delete_query.predicate;
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mutation_commands.emplace_back(mut_command);
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table->checkMutationIsPossible(mutation_commands, getContext()->getSettingsRef());
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MutationsInterpreter::Settings settings(false);
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MutationsInterpreter(table, metadata_snapshot, mutation_commands, getContext(), settings).validate();
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table->mutate(mutation_commands, getContext());
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return {};
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}
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else if (table->supportsLightweightDelete())
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{
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if (!getContext()->getSettingsRef().enable_lightweight_delete)
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throw Exception(ErrorCodes::SUPPORT_IS_DISABLED,
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"Lightweight delete mutate is disabled. "
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"Set `enable_lightweight_delete` setting to enable it");
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/// Build "ALTER ... UPDATE _row_exists = 0 WHERE predicate" query
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String alter_query =
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"ALTER TABLE " + table->getStorageID().getFullTableName()
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+ (delete_query.cluster.empty() ? "" : " ON CLUSTER " + backQuoteIfNeed(delete_query.cluster))
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+ " UPDATE `_row_exists` = 0 WHERE " + serializeAST(*delete_query.predicate);
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ParserAlterQuery parser;
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ASTPtr alter_ast = parseQuery(
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parser,
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alter_query.data(),
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alter_query.data() + alter_query.size(),
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"ALTER query",
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0,
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DBMS_DEFAULT_MAX_PARSER_DEPTH,
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DBMS_DEFAULT_MAX_PARSER_BACKTRACKS);
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auto context = Context::createCopy(getContext());
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context->setSetting("mutations_sync", 2); /// Lightweight delete is always synchronous
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InterpreterAlterQuery alter_interpreter(alter_ast, context);
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return alter_interpreter.execute();
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}
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else
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{
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throw Exception(ErrorCodes::BAD_ARGUMENTS, "DELETE query is not supported for table {}", table->getStorageID().getFullTableName());
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}
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}
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void registerInterpreterDeleteQuery(InterpreterFactory & factory)
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{
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auto create_fn = [] (const InterpreterFactory::Arguments & args)
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{
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return std::make_unique<InterpreterDeleteQuery>(args.query, args.context);
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};
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factory.registerInterpreter("InterpreterDeleteQuery", create_fn);
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}
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}
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