ClickHouse/dbms/src/Functions/array/arrayElement.cpp

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#include <Functions/IFunction.h>
#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 <Core/ColumnNumbers.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnTuple.h>
#include <Common/typeid_cast.h>
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;
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override;
private:
void perform(Block & block, const ColumnNumbers & arguments, size_t result,
ArrayImpl::NullMapBuilder & builder, size_t input_rows_count);
template <typename DataType>
bool executeNumberConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder);
template <typename IndexType, typename DataType>
bool executeNumber(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder);
bool executeStringConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder);
template <typename IndexType>
bool executeString(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder);
bool executeGenericConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder);
template <typename IndexType>
bool executeGeneric(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder);
template <typename IndexType>
bool executeConst(Block & block, const ColumnNumbers & arguments, size_t result,
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,
ArrayImpl::NullMapBuilder & builder, size_t input_rows_count);
/** For a tuple array, the function is evaluated component-wise for each element of the tuple.
*/
bool executeTuple(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count);
};
namespace ArrayImpl
{
class NullMapBuilder
{
public:
operator bool() const { return src_null_map; }
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)
{
const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[0]).column.get());
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);
block.getByPosition(result).column = std::move(col_res);
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)
{
const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[0]).column.get());
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);
block.getByPosition(result).column = std::move(col_res);
return true;
}
bool FunctionArrayElement::executeStringConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder)
{
const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[0]).column.get());
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);
block.getByPosition(result).column = std::move(col_res);
return true;
}
template <typename IndexType>
bool FunctionArrayElement::executeString(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder)
{
const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[0]).column.get());
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);
block.getByPosition(result).column = std::move(col_res);
return true;
}
bool FunctionArrayElement::executeGenericConst(Block & block, const ColumnNumbers & arguments, size_t result, const Field & index,
ArrayImpl::NullMapBuilder & builder)
{
const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[0]).column.get());
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);
block.getByPosition(result).column = std::move(col_res);
return true;
}
template <typename IndexType>
bool FunctionArrayElement::executeGeneric(Block & block, const ColumnNumbers & arguments, size_t result, const PaddedPODArray<IndexType> & indices,
ArrayImpl::NullMapBuilder & builder)
{
const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[0]).column.get());
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);
block.getByPosition(result).column = std::move(col_res);
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)
{
const ColumnArray * col_array = checkAndGetColumnConstData<ColumnArray>(block.getByPosition(arguments[0]).column.get());
if (!col_array)
return false;
auto res = block.getByPosition(result).type->createColumn();
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();
}
}
block.getByPosition(result).column = std::move(res);
return true;
}
template <typename IndexType>
bool FunctionArrayElement::executeArgument(Block & block, const ColumnNumbers & arguments, size_t result,
ArrayImpl::NullMapBuilder & builder, size_t input_rows_count)
{
auto index = checkAndGetColumn<ColumnVector<IndexType>>(block.getByPosition(arguments[1]).column.get());
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)))
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of first argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
return true;
}
bool FunctionArrayElement::executeTuple(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count)
{
const ColumnArray * col_array = typeid_cast<const ColumnArray *>(block.getByPosition(arguments[0]).column.get());
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 &>(
*typeid_cast<const DataTypeArray &>(*block.getByPosition(arguments[0]).type).getNestedType()).getElements();
/** 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;
* ...
*/
Block block_of_temporary_results;
block_of_temporary_results.insert(block.getByPosition(arguments[1]));
/// 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]);
block_of_temporary_results.insert(array_of_tuple_section);
ColumnWithTypeAndName array_elements_of_tuple_section;
array_elements_of_tuple_section.type = getReturnTypeImpl(
{block_of_temporary_results.getByPosition(i * 2 + 1).type, block_of_temporary_results.getByPosition(0).type});
block_of_temporary_results.insert(array_elements_of_tuple_section);
executeImpl(block_of_temporary_results, ColumnNumbers{i * 2 + 1, 0}, i * 2 + 2, input_rows_count);
result_tuple_columns.emplace_back(std::move(block_of_temporary_results.getByPosition(i * 2 + 2).column));
}
block.getByPosition(result).column = ColumnTuple::create(result_tuple_columns);
return true;
}
String FunctionArrayElement::getName() const
{
return name;
}
DataTypePtr FunctionArrayElement::getReturnTypeImpl(const DataTypes & arguments) const
{
const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[0].get());
if (!array_type)
throw Exception("First argument for function " + getName() + " must be array.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
if (!isInteger(arguments[1]))
throw Exception("Second argument for function " + getName() + " must be integer.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
return array_type->getNestedType();
}
void FunctionArrayElement::executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count)
{
/// Check nullability.
bool is_array_of_nullable = false;
const ColumnArray * col_array = nullptr;
const ColumnArray * col_const_array = nullptr;
col_array = checkAndGetColumn<ColumnArray>(block.getByPosition(arguments[0]).column.get());
if (col_array)
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is_array_of_nullable = checkColumn<ColumnNullable>(col_array->getData());
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else
{
col_const_array = checkAndGetColumnConstData<ColumnArray>(block.getByPosition(arguments[0]).column.get());
if (col_const_array)
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is_array_of_nullable = checkColumn<ColumnNullable>(col_const_array->getData());
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else
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " 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;
Block source_block;
const auto & input_type = typeid_cast<const DataTypeNullable &>(*typeid_cast<const DataTypeArray &>(*block.getByPosition(arguments[0]).type).getNestedType()).getNestedType();
const auto & tmp_ret_type = typeid_cast<const DataTypeNullable &>(*block.getByPosition(result).type).getNestedType();
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_block =
{
{
ColumnArray::create(nested_col, col_array->getOffsetsPtr()),
std::make_shared<DataTypeArray>(input_type),
""
},
block.getByPosition(arguments[1]),
{
nullptr,
tmp_ret_type,
""
}
};
builder.initSource(nullable_col.getNullMapData().data());
}
else
{
/// ColumnConst(ColumnArray(ColumnNullable(...)))
const auto & nullable_col = static_cast<const ColumnNullable &>(col_const_array->getData());
const auto & nested_col = nullable_col.getNestedColumnPtr();
source_block =
{
{
ColumnConst::create(ColumnArray::create(nested_col, col_const_array->getOffsetsPtr()), input_rows_count),
std::make_shared<DataTypeArray>(input_type),
""
},
block.getByPosition(arguments[1]),
{
nullptr,
tmp_ret_type,
""
}
};
builder.initSource(nullable_col.getNullMapData().data());
}
perform(source_block, {0, 1}, 2, builder, input_rows_count);
/// Store the result.
const ColumnWithTypeAndName & source_col = source_block.getByPosition(2);
ColumnWithTypeAndName & dest_col = block.getByPosition(result);
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,
ArrayImpl::NullMapBuilder & builder, size_t input_rows_count)
{
if (executeTuple(block, arguments, result, input_rows_count))
{
}
else if (!isColumnConst(*block.getByPosition(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
{
Field index = (*block.getByPosition(arguments[1]).column)[0];
if (builder)
builder.initSink(input_rows_count);
if (index == 0u)
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throw Exception("Array indices is 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)))
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
}
void registerFunctionArrayElement(FunctionFactory & factory)
{
factory.registerFunction<FunctionArrayElement>();
}
}