2019-12-09 13:12:54 +00:00
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#include <Functions/IFunctionImpl.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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}
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/** Usage:
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* hasColumnInTable(['hostname'[, 'username'[, 'password']],] 'database', 'table', 'column')
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*/
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class FunctionHasColumnInTable : public IFunction
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{
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public:
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static constexpr auto name = "hasColumnInTable";
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static FunctionPtr create(const Context & context)
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{
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return std::make_shared<FunctionHasColumnInTable>(context.getGlobalContext());
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}
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explicit FunctionHasColumnInTable(const Context & global_context_) : global_context(global_context_)
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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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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override;
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private:
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const Context & global_context;
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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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void FunctionHasColumnInTable::executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count)
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{
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auto get_string_from_block = [&](size_t column_pos) -> String
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{
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ColumnPtr column = block.getByPosition(column_pos).column;
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const ColumnConst * const_column = checkAndGetColumnConst<ColumnString>(column.get());
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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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host_name = get_string_from_block(arguments[arg++]);
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if (arguments.size() > 4)
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user_name = get_string_from_block(arguments[arg++]);
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if (arguments.size() > 5)
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password = get_string_from_block(arguments[arg++]);
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String database_name = get_string_from_block(arguments[arg++]);
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String table_name = get_string_from_block(arguments[arg++]);
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String column_name = get_string_from_block(arguments[arg++]);
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bool has_column;
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if (host_name.empty())
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{
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2020-05-28 23:01:18 +00:00
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const StoragePtr & table = DatabaseCatalog::instance().getTable({database_name, table_name}, global_context);
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2020-04-27 15:38:35 +00:00
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has_column = table->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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global_context.getSettings(),
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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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global_context.getTCPPort(),
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false);
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2020-03-06 20:38:19 +00:00
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auto remote_columns = getStructureOfRemoteTable(*cluster, {database_name, table_name}, global_context);
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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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2019-01-09 15:44:20 +00:00
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block.getByPosition(result).column = DataTypeUInt8().createColumnConst(input_rows_count, Field(has_column));
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2018-09-08 22:04:39 +00:00
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}
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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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