2021-05-17 07:30:42 +00:00
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#include <Functions/IFunction.h>
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2018-09-08 22:04:39 +00:00
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionHelpers.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnConst.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Storages/IStorage.h>
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#include <Interpreters/Cluster.h>
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#include <Interpreters/Context.h>
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#include <Storages/getStructureOfRemoteTable.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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2020-06-24 16:37:04 +00:00
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extern const int UNKNOWN_TABLE;
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2018-09-08 22:04:39 +00:00
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}
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2020-09-07 18:00:37 +00:00
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namespace
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{
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2018-09-08 22:04:39 +00:00
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/** Usage:
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* hasColumnInTable(['hostname'[, 'username'[, 'password']],] 'database', 'table', 'column')
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*/
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2021-05-28 16:44:59 +00:00
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class FunctionHasColumnInTable : public IFunction, WithConstContext
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2018-09-08 22:04:39 +00:00
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{
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public:
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static constexpr auto name = "hasColumnInTable";
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2021-05-28 16:44:59 +00:00
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static FunctionPtr create(ContextConstPtr context_)
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2018-09-08 22:04:39 +00:00
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{
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2021-04-10 23:33:54 +00:00
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return std::make_shared<FunctionHasColumnInTable>(context_->getGlobalContext());
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2018-09-08 22:04:39 +00:00
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}
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2021-05-28 16:44:59 +00:00
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explicit FunctionHasColumnInTable(ContextConstPtr global_context_) : WithConstContext(global_context_)
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2018-09-08 22:04:39 +00:00
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{
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}
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bool isVariadic() const override
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{
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return true;
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}
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size_t getNumberOfArguments() const override
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{
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return 0;
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}
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String getName() const override
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{
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return name;
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}
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override;
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bool isDeterministic() const override { return false; }
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2020-11-17 13:24:45 +00:00
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override;
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2018-09-08 22:04:39 +00:00
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};
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DataTypePtr FunctionHasColumnInTable::getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const
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{
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if (arguments.size() < 3 || arguments.size() > 6)
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throw Exception{"Invalid number of arguments for function " + getName(),
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH};
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static const std::string arg_pos_description[] = {"First", "Second", "Third", "Fourth", "Fifth", "Sixth"};
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for (size_t i = 0; i < arguments.size(); ++i)
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{
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const ColumnWithTypeAndName & argument = arguments[i];
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if (!checkColumnConst<ColumnString>(argument.column.get()))
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{
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throw Exception(arg_pos_description[i] + " argument for function " + getName() + " must be const String.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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}
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return std::make_shared<DataTypeUInt8>();
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}
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2020-11-17 13:24:45 +00:00
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ColumnPtr FunctionHasColumnInTable::executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const
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{
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auto get_string_from_columns = [&](const ColumnWithTypeAndName & column) -> String
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{
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2020-10-19 13:42:14 +00:00
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const ColumnConst * const_column = checkAndGetColumnConst<ColumnString>(column.column.get());
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2018-09-08 22:04:39 +00:00
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return const_column->getValue<String>();
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};
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size_t arg = 0;
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String host_name;
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String user_name;
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String password;
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if (arguments.size() > 3)
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2020-10-14 14:04:50 +00:00
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host_name = get_string_from_columns(arguments[arg++]);
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2018-09-08 22:04:39 +00:00
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if (arguments.size() > 4)
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2020-10-14 14:04:50 +00:00
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user_name = get_string_from_columns(arguments[arg++]);
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2018-09-08 22:04:39 +00:00
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if (arguments.size() > 5)
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2020-10-14 14:04:50 +00:00
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password = get_string_from_columns(arguments[arg++]);
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2018-09-08 22:04:39 +00:00
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2020-10-14 14:04:50 +00:00
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String database_name = get_string_from_columns(arguments[arg++]);
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String table_name = get_string_from_columns(arguments[arg++]);
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String column_name = get_string_from_columns(arguments[arg++]);
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2018-09-08 22:04:39 +00:00
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2020-06-24 16:37:04 +00:00
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if (table_name.empty())
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throw Exception("Table name is empty", ErrorCodes::UNKNOWN_TABLE);
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2018-09-08 22:04:39 +00:00
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bool has_column;
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if (host_name.empty())
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{
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2021-05-28 16:44:59 +00:00
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// FIXME this (probably) needs a non-constant access to query context,
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// because it might initialized a storage. Ideally, the tables required
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// by the query should be initialized at an earlier stage.
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const StoragePtr & table = DatabaseCatalog::instance().getTable(
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{database_name, table_name},
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const_pointer_cast<Context>(getContext()));
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2020-06-17 16:39:58 +00:00
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auto table_metadata = table->getInMemoryMetadataPtr();
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has_column = table_metadata->getColumns().hasPhysical(column_name);
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2018-09-08 22:04:39 +00:00
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}
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else
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{
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std::vector<std::vector<String>> host_names = {{ host_name }};
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auto cluster = std::make_shared<Cluster>(
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2021-04-10 23:33:54 +00:00
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getContext()->getSettings(),
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2018-09-08 22:04:39 +00:00
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host_names,
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!user_name.empty() ? user_name : "default",
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password,
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2021-04-10 23:33:54 +00:00
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getContext()->getTCPPort(),
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2018-09-08 22:04:39 +00:00
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false);
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2021-05-28 16:44:59 +00:00
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// FIXME this (probably) needs a non-constant access to query context,
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// because it might initialized a storage. Ideally, the tables required
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// by the query should be initialized at an earlier stage.
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auto remote_columns = getStructureOfRemoteTable(*cluster,
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{database_name, table_name},
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const_pointer_cast<Context>(getContext()));
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2018-09-08 22:04:39 +00:00
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has_column = remote_columns.hasPhysical(column_name);
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}
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2021-05-08 20:50:12 +00:00
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return DataTypeUInt8().createColumnConst(input_rows_count, Field{UInt64(has_column)});
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2018-09-08 22:04:39 +00:00
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}
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2020-09-07 18:00:37 +00:00
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}
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2018-09-08 22:04:39 +00:00
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void registerFunctionHasColumnInTable(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionHasColumnInTable>();
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}
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}
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