ClickHouse/src/Functions/array/arrayElement.cpp

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#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/DataTypeTuple.h>
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#include <DataTypes/DataTypeMap.h>
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#include <Core/ColumnNumbers.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnTuple.h>
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#include <Columns/ColumnMap.h>
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#include <Common/typeid_cast.h>
#include <Common/assert_cast.h>
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namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int ZERO_ARRAY_OR_TUPLE_INDEX;
}
namespace ArrayImpl
{
class NullMapBuilder;
}
/** arrayElement(arr, i) - get the array element by index. If index is not constant and out of range - return default value of data type.
* The index begins with 1. Also, the index can be negative - then it is counted from the end of the array.
*/
class FunctionArrayElement : public IFunction
{
public:
static constexpr auto name = "arrayElement";
static FunctionPtr create(const Context & context);
String getName() const override;
bool useDefaultImplementationForConstants() const override { return true; }
size_t getNumberOfArguments() const override { return 2; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override;
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const override;
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private:
void perform(Block & block, const ColumnNumbers & arguments, size_t result,
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ArrayImpl::NullMapBuilder & builder, size_t input_rows_count) const;
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template <typename DataType>
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static bool executeNumberConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
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ArrayImpl::NullMapBuilder & builder);
template <typename IndexType, typename DataType>
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static bool executeNumber(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
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ArrayImpl::NullMapBuilder & builder);
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static bool executeStringConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
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ArrayImpl::NullMapBuilder & builder);
template <typename IndexType>
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static bool executeString(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
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ArrayImpl::NullMapBuilder & builder);
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static bool executeGenericConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
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ArrayImpl::NullMapBuilder & builder);
template <typename IndexType>
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static bool executeGeneric(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
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ArrayImpl::NullMapBuilder & builder);
template <typename IndexType>
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static bool executeConst(Block & block, const ColumnNumbers & arguments, size_t result,
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const PaddedPODArray <IndexType> & indices, ArrayImpl::NullMapBuilder & builder,
size_t input_rows_count);
template <typename IndexType>
bool executeArgument(Block & block, const ColumnNumbers & arguments, size_t result,
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ArrayImpl::NullMapBuilder & builder, size_t input_rows_count) const;
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/** For a tuple array, the function is evaluated component-wise for each element of the tuple.
*/
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bool executeTuple(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const;
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/** For a Map, the function is to find the matched key's value
*/
bool executeMap(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const;
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};
namespace ArrayImpl
{
class NullMapBuilder
{
public:
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explicit operator bool() const { return src_null_map; }
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bool operator!() const { return !src_null_map; }
void initSource(const UInt8 * src_null_map_)
{
src_null_map = src_null_map_;
}
void initSink(size_t size)
{
auto sink = ColumnUInt8::create(size);
sink_null_map = sink->getData().data();
sink_null_map_holder = std::move(sink);
}
void update(size_t from)
{
sink_null_map[index] = bool(src_null_map && src_null_map[from]);
++index;
}
void update()
{
sink_null_map[index] = bool(src_null_map);
++index;
}
ColumnPtr getNullMapColumnPtr() && { return std::move(sink_null_map_holder); }
private:
const UInt8 * src_null_map = nullptr;
UInt8 * sink_null_map = nullptr;
MutableColumnPtr sink_null_map_holder;
size_t index = 0;
};
}
namespace
{
template <typename T>
struct ArrayElementNumImpl
{
/** Implementation for constant index.
* If negative = false - index is from beginning of array, started from 0.
* If negative = true - index is from end of array, started from 0.
*/
template <bool negative>
static void vectorConst(
const PaddedPODArray<T> & data, const ColumnArray::Offsets & offsets,
const ColumnArray::Offset index,
PaddedPODArray<T> & result, ArrayImpl::NullMapBuilder & builder)
{
size_t size = offsets.size();
result.resize(size);
ColumnArray::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
size_t array_size = offsets[i] - current_offset;
if (index < array_size)
{
size_t j = !negative ? (current_offset + index) : (offsets[i] - index - 1);
result[i] = data[j];
if (builder)
builder.update(j);
}
else
{
result[i] = T();
if (builder)
builder.update();
}
current_offset = offsets[i];
}
}
/** Implementation for non-constant index.
*/
template <typename TIndex>
static void vector(
const PaddedPODArray<T> & data, const ColumnArray::Offsets & offsets,
const PaddedPODArray<TIndex> & indices,
PaddedPODArray<T> & result, ArrayImpl::NullMapBuilder & builder)
{
size_t size = offsets.size();
result.resize(size);
ColumnArray::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
size_t array_size = offsets[i] - current_offset;
TIndex index = indices[i];
if (index > 0 && static_cast<size_t>(index) <= array_size)
{
size_t j = current_offset + index - 1;
result[i] = data[j];
if (builder)
builder.update(j);
}
else if (index < 0 && static_cast<size_t>(-index) <= array_size)
{
size_t j = offsets[i] + index;
result[i] = data[j];
if (builder)
builder.update(j);
}
else
{
result[i] = T();
if (builder)
builder.update();
}
current_offset = offsets[i];
}
}
};
struct ArrayElementStringImpl
{
template <bool negative>
static void vectorConst(
const ColumnString::Chars & data, const ColumnArray::Offsets & offsets, const ColumnString::Offsets & string_offsets,
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const ColumnArray::Offset index,
ColumnString::Chars & result_data, ColumnArray::Offsets & result_offsets,
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ArrayImpl::NullMapBuilder & builder)
{
size_t size = offsets.size();
result_offsets.resize(size);
result_data.reserve(data.size());
ColumnArray::Offset current_offset = 0;
ColumnArray::Offset current_result_offset = 0;
for (size_t i = 0; i < size; ++i)
{
size_t array_size = offsets[i] - current_offset;
if (index < array_size)
{
size_t adjusted_index = !negative ? index : (array_size - index - 1);
size_t j = current_offset + adjusted_index;
if (builder)
builder.update(j);
ColumnArray::Offset string_pos = current_offset == 0 && adjusted_index == 0
? 0
: string_offsets[current_offset + adjusted_index - 1];
ColumnArray::Offset string_size = string_offsets[current_offset + adjusted_index] - string_pos;
result_data.resize(current_result_offset + string_size);
memcpySmallAllowReadWriteOverflow15(&result_data[current_result_offset], &data[string_pos], string_size);
current_result_offset += string_size;
result_offsets[i] = current_result_offset;
}
else
{
/// Insert an empty row.
result_data.resize(current_result_offset + 1);
result_data[current_result_offset] = 0;
current_result_offset += 1;
result_offsets[i] = current_result_offset;
if (builder)
builder.update();
}
current_offset = offsets[i];
}
}
/** Implementation for non-constant index.
*/
template <typename TIndex>
static void vector(
const ColumnString::Chars & data, const ColumnArray::Offsets & offsets, const ColumnString::Offsets & string_offsets,
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const PaddedPODArray<TIndex> & indices,
ColumnString::Chars & result_data, ColumnArray::Offsets & result_offsets,
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ArrayImpl::NullMapBuilder & builder)
{
size_t size = offsets.size();
result_offsets.resize(size);
result_data.reserve(data.size());
ColumnArray::Offset current_offset = 0;
ColumnArray::Offset current_result_offset = 0;
for (size_t i = 0; i < size; ++i)
{
size_t array_size = offsets[i] - current_offset;
size_t adjusted_index; /// index in array from zero
TIndex index = indices[i];
if (index > 0 && static_cast<size_t>(index) <= array_size)
adjusted_index = index - 1;
else if (index < 0 && static_cast<size_t>(-index) <= array_size)
adjusted_index = array_size + index;
else
adjusted_index = array_size; /// means no element should be taken
if (adjusted_index < array_size)
{
size_t j = current_offset + adjusted_index;
if (builder)
builder.update(j);
ColumnArray::Offset string_pos = current_offset == 0 && adjusted_index == 0
? 0
: string_offsets[current_offset + adjusted_index - 1];
ColumnArray::Offset string_size = string_offsets[current_offset + adjusted_index] - string_pos;
result_data.resize(current_result_offset + string_size);
memcpySmallAllowReadWriteOverflow15(&result_data[current_result_offset], &data[string_pos], string_size);
current_result_offset += string_size;
result_offsets[i] = current_result_offset;
}
else
{
/// Insert empty string
result_data.resize(current_result_offset + 1);
result_data[current_result_offset] = 0;
current_result_offset += 1;
result_offsets[i] = current_result_offset;
if (builder)
builder.update();
}
current_offset = offsets[i];
}
}
};
/// Generic implementation for other nested types.
struct ArrayElementGenericImpl
{
template <bool negative>
static void vectorConst(
const IColumn & data, const ColumnArray::Offsets & offsets,
const ColumnArray::Offset index,
IColumn & result, ArrayImpl::NullMapBuilder & builder)
{
size_t size = offsets.size();
result.reserve(size);
ColumnArray::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
size_t array_size = offsets[i] - current_offset;
if (index < array_size)
{
size_t j = !negative ? current_offset + index : offsets[i] - index - 1;
result.insertFrom(data, j);
if (builder)
builder.update(j);
}
else
{
result.insertDefault();
if (builder)
builder.update();
}
current_offset = offsets[i];
}
}
/** Implementation for non-constant index.
*/
template <typename TIndex>
static void vector(
const IColumn & data, const ColumnArray::Offsets & offsets,
const PaddedPODArray<TIndex> & indices,
IColumn & result, ArrayImpl::NullMapBuilder & builder)
{
size_t size = offsets.size();
result.reserve(size);
ColumnArray::Offset current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
size_t array_size = offsets[i] - current_offset;
TIndex index = indices[i];
if (index > 0 && static_cast<size_t>(index) <= array_size)
{
size_t j = current_offset + index - 1;
result.insertFrom(data, j);
if (builder)
builder.update(j);
}
else if (index < 0 && static_cast<size_t>(-index) <= array_size)
{
size_t j = offsets[i] + index;
result.insertFrom(data, j);
if (builder)
builder.update(j);
}
else
{
result.insertDefault();
if (builder)
builder.update();
}
current_offset = offsets[i];
}
}
};
}
FunctionPtr FunctionArrayElement::create(const Context &)
{
return std::make_shared<FunctionArrayElement>();
}
template <typename DataType>
bool FunctionArrayElement::executeNumberConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder)
{
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const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block[arguments[0]].column.get());
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if (!col_array)
return false;
const ColumnVector<DataType> * col_nested = checkAndGetColumn<ColumnVector<DataType>>(&col_array->getData());
if (!col_nested)
return false;
auto col_res = ColumnVector<DataType>::create();
if (index.getType() == Field::Types::UInt64)
ArrayElementNumImpl<DataType>::template vectorConst<false>(
col_nested->getData(), col_array->getOffsets(), safeGet<UInt64>(index) - 1, col_res->getData(), builder);
else if (index.getType() == Field::Types::Int64)
ArrayElementNumImpl<DataType>::template vectorConst<true>(
col_nested->getData(), col_array->getOffsets(), -safeGet<Int64>(index) - 1, col_res->getData(), builder);
else
throw Exception("Illegal type of array index", ErrorCodes::LOGICAL_ERROR);
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block[result].column = std::move(col_res);
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return true;
}
template <typename IndexType, typename DataType>
bool FunctionArrayElement::executeNumber(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder)
{
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const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block[arguments[0]].column.get());
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if (!col_array)
return false;
const ColumnVector<DataType> * col_nested = checkAndGetColumn<ColumnVector<DataType>>(&col_array->getData());
if (!col_nested)
return false;
auto col_res = ColumnVector<DataType>::create();
ArrayElementNumImpl<DataType>::template vector<IndexType>(
col_nested->getData(), col_array->getOffsets(), indices, col_res->getData(), builder);
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block[result].column = std::move(col_res);
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return true;
}
bool FunctionArrayElement::executeStringConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder)
{
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const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block[arguments[0]].column.get());
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if (!col_array)
return false;
const ColumnString * col_nested = checkAndGetColumn<ColumnString>(&col_array->getData());
if (!col_nested)
return false;
auto col_res = ColumnString::create();
if (index.getType() == Field::Types::UInt64)
ArrayElementStringImpl::vectorConst<false>(
col_nested->getChars(),
col_array->getOffsets(),
col_nested->getOffsets(),
safeGet<UInt64>(index) - 1,
col_res->getChars(),
col_res->getOffsets(),
builder);
else if (index.getType() == Field::Types::Int64)
ArrayElementStringImpl::vectorConst<true>(
col_nested->getChars(),
col_array->getOffsets(),
col_nested->getOffsets(),
-safeGet<Int64>(index) - 1,
col_res->getChars(),
col_res->getOffsets(),
builder);
else
throw Exception("Illegal type of array index", ErrorCodes::LOGICAL_ERROR);
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block[result].column = std::move(col_res);
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return true;
}
template <typename IndexType>
bool FunctionArrayElement::executeString(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder)
{
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const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block[arguments[0]].column.get());
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if (!col_array)
return false;
const ColumnString * col_nested = checkAndGetColumn<ColumnString>(&col_array->getData());
if (!col_nested)
return false;
auto col_res = ColumnString::create();
ArrayElementStringImpl::vector<IndexType>(
col_nested->getChars(),
col_array->getOffsets(),
col_nested->getOffsets(),
indices,
col_res->getChars(),
col_res->getOffsets(),
builder);
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block[result].column = std::move(col_res);
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return true;
}
bool FunctionArrayElement::executeGenericConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder)
{
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const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block[arguments[0]].column.get());
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if (!col_array)
return false;
const auto & col_nested = col_array->getData();
auto col_res = col_nested.cloneEmpty();
if (index.getType() == Field::Types::UInt64)
ArrayElementGenericImpl::vectorConst<false>(
col_nested, col_array->getOffsets(), safeGet<UInt64>(index) - 1, *col_res, builder);
else if (index.getType() == Field::Types::Int64)
ArrayElementGenericImpl::vectorConst<true>(
col_nested, col_array->getOffsets(), -safeGet<Int64>(index) - 1, *col_res, builder);
else
throw Exception("Illegal type of array index", ErrorCodes::LOGICAL_ERROR);
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block[result].column = std::move(col_res);
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return true;
}
template <typename IndexType>
bool FunctionArrayElement::executeGeneric(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder)
{
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const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block[arguments[0]].column.get());
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if (!col_array)
return false;
const auto & col_nested = col_array->getData();
auto col_res = col_nested.cloneEmpty();
ArrayElementGenericImpl::vector<IndexType>(
col_nested, col_array->getOffsets(), indices, *col_res, builder);
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block[result].column = std::move(col_res);
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return true;
}
template <typename IndexType>
bool FunctionArrayElement::executeConst(Block & block, const ColumnNumbers & arguments, size_t result,
const PaddedPODArray <IndexType> & indices, ArrayImpl::NullMapBuilder & builder,
size_t input_rows_count)
{
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const ColumnArray * col_array = checkAndGetColumnConstData<ColumnArray>(block[arguments[0]].column.get());
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if (!col_array)
return false;
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auto res = block[result].type->createColumn();
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size_t rows = input_rows_count;
const IColumn & array_elements = col_array->getData();
size_t array_size = array_elements.size();
for (size_t i = 0; i < rows; ++i)
{
IndexType index = indices[i];
if (index > 0 && static_cast<size_t>(index) <= array_size)
{
size_t j = index - 1;
res->insertFrom(array_elements, j);
if (builder)
builder.update(j);
}
else if (index < 0 && static_cast<size_t>(-index) <= array_size)
{
size_t j = array_size + index;
res->insertFrom(array_elements, j);
if (builder)
builder.update(j);
}
else
{
res->insertDefault();
if (builder)
builder.update();
}
}
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block[result].column = std::move(res);
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return true;
}
template <typename IndexType>
bool FunctionArrayElement::executeArgument(Block & block, const ColumnNumbers & arguments, size_t result,
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ArrayImpl::NullMapBuilder & builder, size_t input_rows_count) const
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{
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auto index = checkAndGetColumn<ColumnVector<IndexType>>(block[arguments[1]].column.get());
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if (!index)
return false;
const auto & index_data = index->getData();
if (builder)
builder.initSink(index_data.size());
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if (!(executeNumber<IndexType, UInt8>(block, arguments, result, index_data, builder)
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|| executeNumber<IndexType, UInt16>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, UInt32>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, UInt64>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, Int8>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, Int16>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, Int32>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, Int64>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, Float32>(block, arguments, result, index_data, builder)
|| executeNumber<IndexType, Float64>(block, arguments, result, index_data, builder)
|| executeConst<IndexType>(block, arguments, result, index_data, builder, input_rows_count)
|| executeString<IndexType>(block, arguments, result, index_data, builder)
|| executeGeneric<IndexType>(block, arguments, result, index_data, builder)))
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throw Exception("Illegal column " + block[arguments[0]].column->getName()
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+ " of first argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
return true;
}
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bool FunctionArrayElement::executeTuple(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const
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{
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const ColumnArray * col_array = typeid_cast<const ColumnArray *>(block[arguments[0]].column.get());
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if (!col_array)
return false;
const ColumnTuple * col_nested = typeid_cast<const ColumnTuple *>(&col_array->getData());
if (!col_nested)
return false;
const auto & tuple_columns = col_nested->getColumns();
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size_t tuple_size = tuple_columns.size();
const DataTypes & tuple_types = typeid_cast<const DataTypeTuple &>(
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*typeid_cast<const DataTypeArray &>(*block[arguments[0]].type).getNestedType()).getElements();
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/** We will calculate the function for the tuple of the internals of the array.
* To do this, create a temporary block.
* It will consist of the following columns
* - the index of the array to be taken;
* - an array of the first elements of the tuples;
* - the result of taking the elements by the index for an array of the first elements of the tuples;
* - array of the second elements of the tuples;
* - result of taking elements by index for an array of second elements of tuples;
* ...
*/
ColumnsWithTypeAndName temporary_results;
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temporary_results.emplace_back(block[arguments[1]]);
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/// results of taking elements by index for arrays from each element of the tuples;
Columns result_tuple_columns;
for (size_t i = 0; i < tuple_size; ++i)
{
ColumnWithTypeAndName array_of_tuple_section;
array_of_tuple_section.column = ColumnArray::create(tuple_columns[i], col_array->getOffsetsPtr());
array_of_tuple_section.type = std::make_shared<DataTypeArray>(tuple_types[i]);
temporary_results.emplace_back(array_of_tuple_section);
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ColumnWithTypeAndName array_elements_of_tuple_section;
array_elements_of_tuple_section.type = getReturnTypeImpl(
{temporary_results[i * 2 + 1].type, temporary_results[0].type});
temporary_results.emplace_back(array_elements_of_tuple_section);
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executeImpl(temporary_results, ColumnNumbers{i * 2 + 1, 0}, i * 2 + 2, input_rows_count);
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result_tuple_columns.emplace_back(std::move(temporary_results[i * 2 + 2].column));
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}
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block[result].column = ColumnTuple::create(result_tuple_columns);
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return true;
}
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static bool getMappedKey(const ColumnArray * col_keys_untyped, Field & index, const DB::TypeIndex key_type, std::vector<int> &matchedIdx)
{
const IColumn & col_keys = col_keys_untyped->getData();
const ColumnArray::Offsets & offsets = col_keys_untyped->getOffsets();
size_t rows = offsets.size();
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switch (key_type)
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{
case TypeIndex::String:
{
const ColumnString * keys = checkAndGetColumn<ColumnString>(&col_keys);
String str = index.get<String>();
for (size_t i = 0; i < rows; i++)
{
size_t begin = offsets[i - 1];
size_t end = offsets[i];
for (size_t j = begin; j < end; j++)
{
if (strcmp(keys->getDataAt(j).data, str.data()) == 0)
{
matchedIdx.push_back(j);
break;
}
}
}
return true;
}
default:
return false;
}
}
static bool getMappedValue(const ColumnArray * col_values_untyped, std::vector<int> matchedIdx, const DB::TypeIndex value_type, IColumn * col_res_untyped)
{
const IColumn & col_values = col_values_untyped->getData();
const ColumnArray::Offsets & offsets = col_values_untyped->getOffsets();
size_t rows = offsets.size();
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switch (value_type)
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{
case TypeIndex::String:
{
ColumnString * col_res = assert_cast<ColumnString *>(col_res_untyped);
StringRef res_str;
for (size_t i = 0; i < rows; i++)
{
if (matchedIdx[i] != -1)
{
res_str = col_values.getDataAt(matchedIdx[i]);
col_res->insertData(res_str.data, res_str.size);
}
else
{
// Default value for unmatched keys
col_res->insertData("null", 4);
}
}
return true;
}
default:
return false;
}
}
bool FunctionArrayElement::executeMap(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const
{
const ColumnMap * col_map = typeid_cast<const ColumnMap *>(block[arguments[0]].column.get());
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if (!col_map)
return false;
const DataTypes & kv_types = assert_cast<const DataTypeMap *>(block[arguments[0]].type.get())->getElements();
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const DataTypePtr & key_type = (typeid_cast<const DataTypeArray *>(kv_types[0].get()))->getNestedType();
const DataTypePtr & value_type = (typeid_cast<const DataTypeArray *>(kv_types[1].get()))->getNestedType();
Field index = (*block[arguments[1]].column)[0];
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if (strcmp(index.getTypeName(), key_type->getName().data()) != 0)
throw Exception (ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Second argument for key's type must be '{}', got '{}' instead",
key_type->getName(), index.getTypeName());
// Get Matched key's value
const ColumnArray * col_keys_untyped = typeid_cast<const ColumnArray *>(&col_map->getColumn(0));
const ColumnArray * col_values_untyped = typeid_cast<const ColumnArray *>(&col_map->getColumn(1));
size_t rows = col_keys_untyped->getOffsets().size();
auto col_res_untyped = value_type->createColumn();
if (rows > 0)
{
if (input_rows_count)
assert(input_rows_count == rows);
std::vector<int> matchedIdx;
if (!getMappedKey(col_keys_untyped, index, key_type->getTypeId(), matchedIdx))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "key type unmatched, we need type '{}' failed", key_type->getName());
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if (!getMappedValue(col_values_untyped, matchedIdx, value_type->getTypeId(), col_res_untyped.get()))
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "value type unmatched, we need type '{}' failed", value_type->getName());
}
block[result].column = std::move(col_res_untyped);
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return true;
}
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String FunctionArrayElement::getName() const
{
return name;
}
DataTypePtr FunctionArrayElement::getReturnTypeImpl(const DataTypes & arguments) const
{
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if (arguments[0]->getTypeId() == TypeIndex::Map)
{
const DataTypeMap * map_type = checkAndGetDataType<DataTypeMap>(arguments[0].get());
const DataTypes & kv_types = map_type->getElements();
return typeid_cast<const DataTypeArray *>(kv_types[1].get())->getNestedType();
}
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const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[0].get());
if (!array_type)
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{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"First argument for function '{}' must be array, got '{}' instead",
getName(), arguments[0]->getName());
}
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if (!isInteger(arguments[1]))
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{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Second argument for function '{}' must be integer, got '{}' instead",
getName(), arguments[1]->getName());
}
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return array_type->getNestedType();
}
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void FunctionArrayElement::executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const
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{
/// Check nullability.
bool is_array_of_nullable = false;
const ColumnArray * col_array = nullptr;
const ColumnArray * col_const_array = nullptr;
const ColumnMap * col_map = checkAndGetColumn<ColumnMap>(block[arguments[0]].column.get());
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if (col_map)
{
executeMap(block, arguments, result, input_rows_count);
return;
}
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col_array = checkAndGetColumn<ColumnArray>(block[arguments[0]].column.get());
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if (col_array)
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is_array_of_nullable = isColumnNullable(col_array->getData());
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else
{
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col_const_array = checkAndGetColumnConstData<ColumnArray>(block[arguments[0]].column.get());
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if (col_const_array)
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is_array_of_nullable = isColumnNullable(col_const_array->getData());
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else
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throw Exception("Illegal column " + block[arguments[0]].column->getName()
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+ " of first argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
}
if (!is_array_of_nullable)
{
ArrayImpl::NullMapBuilder builder;
perform(block, arguments, result, builder, input_rows_count);
}
else
{
/// Perform initializations.
ArrayImpl::NullMapBuilder builder;
ColumnsWithTypeAndName source_columns;
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const DataTypePtr & input_type = typeid_cast<const DataTypeNullable &>(
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*typeid_cast<const DataTypeArray &>(*block[arguments[0]].type).getNestedType()).getNestedType();
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DataTypePtr tmp_ret_type = removeNullable(block[result].type);
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if (col_array)
{
const auto & nullable_col = typeid_cast<const ColumnNullable &>(col_array->getData());
const auto & nested_col = nullable_col.getNestedColumnPtr();
/// Put nested_col inside a ColumnArray.
source_columns =
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{
{
ColumnArray::create(nested_col, col_array->getOffsetsPtr()),
std::make_shared<DataTypeArray>(input_type),
""
},
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block[arguments[1]],
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{
nullptr,
tmp_ret_type,
""
}
};
builder.initSource(nullable_col.getNullMapData().data());
}
else
{
/// ColumnConst(ColumnArray(ColumnNullable(...)))
const auto & nullable_col = assert_cast<const ColumnNullable &>(col_const_array->getData());
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const auto & nested_col = nullable_col.getNestedColumnPtr();
source_columns =
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{
{
ColumnConst::create(ColumnArray::create(nested_col, col_const_array->getOffsetsPtr()), input_rows_count),
std::make_shared<DataTypeArray>(input_type),
""
},
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block[arguments[1]],
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{
nullptr,
tmp_ret_type,
""
}
};
builder.initSource(nullable_col.getNullMapData().data());
}
perform(source_columns, {0, 1}, 2, builder, input_rows_count);
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/// Store the result.
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const ColumnWithTypeAndName & source_col = source_columns[2];
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ColumnWithTypeAndName & dest_col = block[result];
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dest_col.column = ColumnNullable::create(source_col.column, builder ? std::move(builder).getNullMapColumnPtr() : ColumnUInt8::create());
}
}
void FunctionArrayElement::perform(Block & block, const ColumnNumbers & arguments, size_t result,
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ArrayImpl::NullMapBuilder & builder, size_t input_rows_count) const
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{
if (executeTuple(block, arguments, result, input_rows_count))
{
}
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else if (!isColumnConst(*block[arguments[1]].column))
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{
if (!(executeArgument<UInt8>(block, arguments, result, builder, input_rows_count)
|| executeArgument<UInt16>(block, arguments, result, builder, input_rows_count)
|| executeArgument<UInt32>(block, arguments, result, builder, input_rows_count)
|| executeArgument<UInt64>(block, arguments, result, builder, input_rows_count)
|| executeArgument<Int8>(block, arguments, result, builder, input_rows_count)
|| executeArgument<Int16>(block, arguments, result, builder, input_rows_count)
|| executeArgument<Int32>(block, arguments, result, builder, input_rows_count)
|| executeArgument<Int64>(block, arguments, result, builder, input_rows_count)))
throw Exception("Second argument for function " + getName() + " must must have UInt or Int type.",
ErrorCodes::ILLEGAL_COLUMN);
}
else
{
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Field index = (*block[arguments[1]].column)[0];
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if (builder)
builder.initSink(input_rows_count);
if (index == 0u)
throw Exception("Array indices are 1-based", ErrorCodes::ZERO_ARRAY_OR_TUPLE_INDEX);
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if (!(executeNumberConst<UInt8>(block, arguments, result, index, builder)
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|| executeNumberConst<UInt16>(block, arguments, result, index, builder)
|| executeNumberConst<UInt32>(block, arguments, result, index, builder)
|| executeNumberConst<UInt64>(block, arguments, result, index, builder)
|| executeNumberConst<Int8>(block, arguments, result, index, builder)
|| executeNumberConst<Int16>(block, arguments, result, index, builder)
|| executeNumberConst<Int32>(block, arguments, result, index, builder)
|| executeNumberConst<Int64>(block, arguments, result, index, builder)
|| executeNumberConst<Float32>(block, arguments, result, index, builder)
|| executeNumberConst<Float64>(block, arguments, result, index, builder)
|| executeStringConst (block, arguments, result, index, builder)
|| executeGenericConst (block, arguments, result, index, builder)))
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throw Exception("Illegal column " + block[arguments[0]].column->getName()
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+ " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
}
void registerFunctionArrayElement(FunctionFactory & factory)
{
factory.registerFunction<FunctionArrayElement>();
}
}