| 40 | |
| 41 | |
| 42 | void TableFunctionRemote::parseArguments(const ASTPtr & ast_function, ContextPtr context) |
| 43 | { |
| 44 | ASTs & args_func = ast_function->children; |
| 45 | |
| 46 | String cluster_name; |
| 47 | String cluster_description; |
| 48 | String database = "system"; |
| 49 | String table = "one"; /// The table containing one row is used by default for queries without explicit table specification. |
| 50 | String username = "default"; |
| 51 | String password; |
| 52 | |
| 53 | if (args_func.size() != 1) |
| 54 | throw Exception(help_message, ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH); |
| 55 | |
| 56 | ASTs & args = args_func.at(0)->children; |
| 57 | |
| 58 | /** |
| 59 | * Number of arguments for remote function is 6. |
| 60 | * Number of arguments for cluster function is 4. |
| 61 | * For now named collection can be used only for remote as cluster does not require credentials. |
| 62 | */ |
| 63 | size_t max_args = is_cluster_function ? 4 : 6; |
| 64 | NamedCollectionPtr named_collection; |
| 65 | VectorWithMemoryTracking<std::pair<std::string, ASTPtr>> complex_args; |
| 66 | if (!is_cluster_function && (named_collection = tryGetNamedCollectionWithOverrides(args, context, false, &complex_args))) |
| 67 | { |
| 68 | validateNamedCollection<ValidateKeysMultiset<ExternalDatabaseEqualKeysSet>>( |
| 69 | *named_collection, |
| 70 | {"addresses_expr", "host", "hostname", "table"}, |
| 71 | {"username", "user", "password", "sharding_key", "port", "database", "db"}); |
| 72 | |
| 73 | if (!complex_args.empty()) |
| 74 | { |
| 75 | for (const auto & [arg_name, arg_ast] : complex_args) |
| 76 | { |
| 77 | if (arg_name == "database" || arg_name == "db") |
| 78 | { |
| 79 | /// A table function is allowed here (remote(nc, database = mysql(...))), mirroring the |
| 80 | /// positional signature remote('addr', table_function()). Any other expression is a |
| 81 | /// database name, so a non-function node never reaches TableFunctionFactory::get(). |
| 82 | const auto * function = arg_ast->as<ASTFunction>(); |
| 83 | if (function && TableFunctionFactory::instance().isTableFunctionName(function->name)) |
| 84 | remote_table_function_ptr = arg_ast; |
| 85 | else |
| 86 | database = checkAndGetLiteralArgument<String>( |
| 87 | evaluateConstantExpressionForDatabaseName(arg_ast, context), "database"); |
| 88 | } |
| 89 | else if (arg_name == "sharding_key") |
| 90 | sharding_key = arg_ast; |
| 91 | else |
| 92 | throw Exception(ErrorCodes::BAD_ARGUMENTS, "Unexpected argument representation for {}", arg_name); |
| 93 | } |
| 94 | } |
| 95 | else |
| 96 | database = named_collection->getAnyOrDefault<String>({"db", "database"}, "default"); |
| 97 | |
| 98 | cluster_description = named_collection->getOrDefault<String>("addresses_expr", ""); |
| 99 | if (cluster_description.empty() && named_collection->hasAny({"host", "hostname"})) |
nothing calls this directly
no test coverage detected