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#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Common/HashTable/ClearableHashSet.h>
#include <Common/ColumnsHashing.h>
namespace DB
{
namespace ErrorCodes
{
extern const int SIZES_OF_ARRAYS_DONT_MATCH;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
/// Counts the number of different elements in the array, or the number of different tuples from the elements at the corresponding positions in several arrays.
/// NOTE The implementation partially matches arrayEnumerateUniq.
class FunctionArrayUniq final : public IFunction
{
public:
static constexpr auto name = "arrayUniq";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayUniq>(); }
String getName() const override { return name; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (arguments.empty())
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Number of arguments for function {} doesn't match: passed {}, should be at least 1.",
getName(), arguments.size());
for (size_t i = 0; i < arguments.size(); ++i)
{
const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[i].get());
if (!array_type)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"All arguments for function {} must be arrays but argument {} has type {}.",
getName(), i + 1, arguments[i]->getName());
}
return std::make_shared<DataTypeUInt32>();
}
DataTypePtr getReturnTypeForDefaultImplementationForDynamic() const override
{
return std::make_shared<DataTypeUInt32>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override;
private:
/// Initially allocate a piece of memory for 512 elements. NOTE: This is just a guess.
static constexpr size_t INITIAL_SIZE_DEGREE = 9;
template <typename T>
struct MethodOneNumber
{
using Set = ClearableHashSetWithStackMemory<T, DefaultHash<T>,
INITIAL_SIZE_DEGREE>;
using Method = ColumnsHashing::HashMethodOneNumber<typename Set::value_type, void, T, false>;
};
struct MethodString
{
using Set = ClearableHashSetWithStackMemory<std::string_view, StringViewHash,
INITIAL_SIZE_DEGREE>;
using Method = ColumnsHashing::HashMethodString<typename Set::value_type, void, false, false>;
};
struct MethodFixedString
{
using Set = ClearableHashSetWithStackMemory<std::string_view, StringViewHash,
INITIAL_SIZE_DEGREE>;
using Method = ColumnsHashing::HashMethodFixedString<typename Set::value_type, void, false, false>;
};
struct MethodFixed
{
using Set = ClearableHashSetWithStackMemory<UInt128, UInt128HashCRC32,
INITIAL_SIZE_DEGREE>;
using Method = ColumnsHashing::HashMethodKeysFixed<typename Set::value_type, UInt128, void, false, false, false>;
};
struct MethodHashed
{
using Set = ClearableHashSetWithStackMemory<UInt128, UInt128TrivialHash,
INITIAL_SIZE_DEGREE>;
using Method = ColumnsHashing::HashMethodHashed<typename Set::value_type, void, false>;
};
template <typename Method>
void executeMethod(const ColumnArray::Offsets & offsets, const ColumnRawPtrs & columns, const Sizes & key_sizes,
const NullMap * null_map, ColumnUInt32::Container & res_values) const;
template <typename Method, bool has_null_map>
void executeMethodImpl(const ColumnArray::Offsets & offsets, const ColumnRawPtrs & columns, const Sizes & key_sizes,
const NullMap * null_map, ColumnUInt32::Container & res_values) const;
template <typename T>
bool executeNumber(const ColumnArray::Offsets & offsets, const IColumn & data, const NullMap * null_map, ColumnUInt32::Container & res_values) const;
bool executeString(const ColumnArray::Offsets & offsets, const IColumn & data, const NullMap * null_map, ColumnUInt32::Container & res_values) const;
bool executeFixedString(const ColumnArray::Offsets & offsets, const IColumn & data, const NullMap * null_map, ColumnUInt32::Container & res_values) const;
bool execute128bit(const ColumnArray::Offsets & offsets, const ColumnRawPtrs & columns, ColumnUInt32::Container & res_values) const;
void executeHashed(const ColumnArray::Offsets & offsets, const ColumnRawPtrs & columns, ColumnUInt32::Container & res_values) const;
};
ColumnPtr FunctionArrayUniq::executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const
{
const ColumnArray::Offsets * offsets = nullptr;
const size_t num_arguments = arguments.size();
chassert(num_arguments > 0);
ColumnRawPtrs data_columns(num_arguments);
Columns array_holders;
for (size_t i = 0; i < num_arguments; ++i)
{
const ColumnPtr & array_ptr = arguments[i].column;
const ColumnArray * array = checkAndGetColumn<ColumnArray>(array_ptr.get());
if (!array)
{
const ColumnConst * const_array = checkAndGetColumnConst<ColumnArray>(
arguments[i].column.get());
if (!const_array)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of {}-th argument of function {}",
arguments[i].column->getName(), i + 1, getName());
array_holders.emplace_back(const_array->convertToFullColumn());
array = checkAndGetColumn<ColumnArray>(array_holders.back().get());
}
const ColumnArray::Offsets & offsets_i = array->getOffsets();
if (i == 0)
offsets = &offsets_i;
else if (offsets_i != *offsets)
throw Exception(ErrorCodes::SIZES_OF_ARRAYS_DONT_MATCH, "Lengths of all arrays passed to {} must be equal.",
getName());
const auto * array_data = &array->getData();
data_columns[i] = array_data;
}
const NullMap * null_map = nullptr;
for (size_t i = 0; i < num_arguments; ++i)
{
if (const auto * nullable_col = checkAndGetColumn<ColumnNullable>(data_columns[i]))
{
if (num_arguments == 1)
data_columns[i] = &nullable_col->getNestedColumn();
null_map = &nullable_col->getNullMapData();
break;
}
}
auto res = ColumnUInt32::create();
ColumnUInt32::Container & res_values = res->getData();
res_values.resize(offsets->size());
if (num_arguments == 1)
{
if (!(executeNumber<UInt8>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<UInt16>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<UInt32>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<UInt64>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<Int8>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<Int16>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<Int32>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<Int64>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<Float32>(*offsets, *data_columns[0], null_map, res_values)
|| executeNumber<Float64>(*offsets, *data_columns[0], null_map, res_values)
|| executeFixedString(*offsets, *data_columns[0], null_map, res_values)
|| executeString(*offsets, *data_columns[0], null_map, res_values)))
executeHashed(*offsets, data_columns, res_values);
}
else
{
if (!execute128bit(*offsets, data_columns, res_values))
executeHashed(*offsets, data_columns, res_values);
}
return res;
}
template <typename Method, bool has_null_map>
void FunctionArrayUniq::executeMethodImpl(
const ColumnArray::Offsets & offsets,
const ColumnRawPtrs & columns,
const Sizes & key_sizes,
[[maybe_unused]] const NullMap * null_map,
ColumnUInt32::Container & res_values) const
{
typename Method::Set set;
typename Method::Method method(columns, key_sizes, nullptr);
Arena pool; /// Won't use it;
ColumnArray::Offset prev_off = 0;
for (size_t i = 0; i < offsets.size(); ++i)
{
set.clear();
bool found_null = false;
ColumnArray::Offset off = offsets[i];
for (ColumnArray::Offset j = prev_off; j < off; ++j)
{
if constexpr (has_null_map)
{ // NOLINT
if ((*null_map)[j])
{
found_null = true;
continue;
}
}
method.emplaceKey(set, j, pool);
}
res_values[i] = static_cast<UInt32>(set.size() + found_null);
prev_off = off;
}
}
template <typename Method>
void FunctionArrayUniq::executeMethod(
const ColumnArray::Offsets & offsets,
const ColumnRawPtrs & columns,
const Sizes & key_sizes,
const NullMap * null_map,
ColumnUInt32::Container & res_values) const
{
if (null_map)
executeMethodImpl<Method, true>(offsets, columns, key_sizes, null_map, res_values);
else
executeMethodImpl<Method, false>(offsets, columns, key_sizes, null_map, res_values);
}
template <typename T>
bool FunctionArrayUniq::executeNumber(const ColumnArray::Offsets & offsets, const IColumn & data, const NullMap * null_map, ColumnUInt32::Container & res_values) const
{
const auto * nested = checkAndGetColumn<ColumnVector<T>>(&data);
if (!nested)
return false;
executeMethod<MethodOneNumber<T>>(offsets, {nested}, {}, null_map, res_values);
return true;
}
bool FunctionArrayUniq::executeString(const ColumnArray::Offsets & offsets, const IColumn & data, const NullMap * null_map, ColumnUInt32::Container & res_values) const
{
const auto * nested = checkAndGetColumn<ColumnString>(&data);
if (nested)
executeMethod<MethodString>(offsets, {nested}, {}, null_map, res_values);
return nested;
}
bool FunctionArrayUniq::executeFixedString(const ColumnArray::Offsets & offsets, const IColumn & data, const NullMap * null_map, ColumnUInt32::Container & res_values) const
{
const auto * nested = checkAndGetColumn<ColumnFixedString>(&data);
if (nested)
executeMethod<MethodFixedString>(offsets, {nested}, {}, null_map, res_values);
return nested;
}
bool FunctionArrayUniq::execute128bit(
const ColumnArray::Offsets & offsets,
const ColumnRawPtrs & columns,
ColumnUInt32::Container & res_values) const
{
size_t count = columns.size();
size_t keys_bytes = 0;
Sizes key_sizes(count);
for (size_t j = 0; j < count; ++j)
{
if (!columns[j]->isFixedAndContiguous())
return false;
key_sizes[j] = columns[j]->sizeOfValueIfFixed();
keys_bytes += key_sizes[j];
}
if (keys_bytes > 16)
return false;
executeMethod<MethodFixed>(offsets, columns, key_sizes, nullptr, res_values);
return true;
}
void FunctionArrayUniq::executeHashed(
const ColumnArray::Offsets & offsets,
const ColumnRawPtrs & columns,
ColumnUInt32::Container & res_values) const
{
executeMethod<MethodHashed>(offsets, columns, {}, nullptr, res_values);
}
REGISTER_FUNCTION(ArrayUniq)
{
FunctionDocumentation::Description description = R"(
For a single argument passed, counts the number of different elements in the array.
For multiple arguments passed, it counts the number of different **tuples** made of elements at matching positions across multiple arrays.
For example `SELECT arrayUniq([1,2], [3,4], [5,6])` will form the following tuples:
* Position 1: (1,3,5)
* Position 2: (2,4,6)
It will then count the number of unique tuples. In this case `2`.
All arrays passed must have the same length.
<Tip>
If you want to get a list of unique items in an array, you can use `arrayReduce('groupUniqArray', arr)`.
</Tip>
)";
FunctionDocumentation::Syntax syntax = "arrayUniq(arr1[, arr2, ..., arrN])";
FunctionDocumentation::Arguments arguments = {
{
"arr1",
"Array for which to count the number of unique elements.",
{"Array(T)"}
},
{
"[, arr2, ..., arrN]",
"Optional. Additional arrays used to count the number of unique tuples of elements at corresponding positions in multiple arrays.",
{"Array(T)"}
}
};
FunctionDocumentation::Examples examples =
{{"Single argument", "SELECT arrayUniq([1, 1, 2, 2])", "2"},
{"Multiple argument", "SELECT arrayUniq([1, 2, 3, 1], [4, 5, 6, 4])", "3"}};
FunctionDocumentation::ReturnedValue returned_value = {R"(
For a single argument returns the number of unique
elements. For multiple arguments returns the number of unique tuples made from
elements at corresponding positions across the arrays.
)", {"UInt32"}};
FunctionDocumentation::IntroducedIn introduced_in = {1, 1};
FunctionDocumentation::Category category = FunctionDocumentation::Category::Array;
FunctionDocumentation documentation = {description, syntax, arguments, {}, returned_value, examples, introduced_in, category};
factory.registerFunction<FunctionArrayUniq>(documentation);
}
}