ClickHouse/dbms/Functions/in.cpp

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#include <Functions/IFunctionImpl.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnTuple.h>
#include <Columns/ColumnSet.h>
#include <Interpreters/Set.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
}
/** in(x, set) - function for evaluating the IN
* notIn(x, set) - and NOT IN.
*/
template <bool negative, bool global>
struct FunctionInName;
template <>
struct FunctionInName<false, false>
{
static constexpr auto name = "in";
};
template <>
struct FunctionInName<false, true>
{
static constexpr auto name = "globalIn";
};
template <>
struct FunctionInName<true, false>
{
static constexpr auto name = "notIn";
};
template <>
struct FunctionInName<true, true>
{
static constexpr auto name = "globalNotIn";
};
template <bool negative, bool global>
class FunctionIn : public IFunction
{
public:
static constexpr auto name = FunctionInName<negative, global>::name;
static FunctionPtr create(const Context &)
{
return std::make_shared<FunctionIn>();
}
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override
{
return 2;
}
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
return std::make_shared<DataTypeUInt8>();
}
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bool useDefaultImplementationForConstants() const override { return true; }
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/) override
{
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/// NOTE: after updating this code, check that FunctionIgnoreExceptNull returns the same type of column.
/// Second argument must be ColumnSet.
ColumnPtr column_set_ptr = block.getByPosition(arguments[1]).column;
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const ColumnSet * column_set = checkAndGetColumnConstData<const ColumnSet>(column_set_ptr.get());
if (!column_set)
column_set = checkAndGetColumn<const ColumnSet>(column_set_ptr.get());
if (!column_set)
throw Exception("Second argument for function '" + getName() + "' must be Set; found " + column_set_ptr->getName(),
ErrorCodes::ILLEGAL_COLUMN);
Block block_of_key_columns;
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/// First argument may be a tuple or a single column.
const ColumnWithTypeAndName & left_arg = block.getByPosition(arguments[0]);
const ColumnTuple * tuple = typeid_cast<const ColumnTuple *>(left_arg.column.get());
const ColumnConst * const_tuple = checkAndGetColumnConst<ColumnTuple>(left_arg.column.get());
const DataTypeTuple * type_tuple = typeid_cast<const DataTypeTuple *>(left_arg.type.get());
ColumnPtr materialized_tuple;
if (const_tuple)
{
materialized_tuple = const_tuple->convertToFullColumn();
tuple = typeid_cast<const ColumnTuple *>(materialized_tuple.get());
}
auto set = column_set->getData();
auto set_types = set->getDataTypes();
if (tuple && (set_types.size() != 1 || !set_types[0]->equals(*type_tuple)))
{
const auto & tuple_columns = tuple->getColumns();
const DataTypes & tuple_types = type_tuple->getElements();
size_t tuple_size = tuple_columns.size();
for (size_t i = 0; i < tuple_size; ++i)
block_of_key_columns.insert({ tuple_columns[i], tuple_types[i], "" });
}
else
block_of_key_columns.insert(left_arg);
block.getByPosition(result).column = set->execute(block_of_key_columns, negative);
}
};
void registerFunctionsIn(FunctionFactory & factory)
{
factory.registerFunction<FunctionIn<false, false>>();
factory.registerFunction<FunctionIn<false, true>>();
factory.registerFunction<FunctionIn<true, false>>();
factory.registerFunction<FunctionIn<true, true>>();
}
}