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#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include "FunctionArrayMapped.h"
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
}
/** Replaces values where condition is met with the previous value that have condition not met
* (or with the first value if condition was true for all elements before).
* Looks somewhat similar to arrayFilter, but instead removing elements, it fills gaps with the value of previous element.
*/
template <bool reverse>
struct ArrayFillImpl
{
static bool needBoolean() { return true; }
static bool needExpression() { return true; }
static bool needOneArray() { return false; }
static DataTypePtr getReturnType(const DataTypePtr & /*expression_return*/, const DataTypePtr & array_element)
{
return std::make_shared<DataTypeArray>(array_element);
}
static ColumnPtr execute(const ColumnArray & array, ColumnPtr mapped)
{
const ColumnUInt8 * column_fill = typeid_cast<const ColumnUInt8 *>(&*mapped);
const IColumn & in_data = array.getData();
const IColumn::Offsets & in_offsets = array.getOffsets();
auto column_data = in_data.cloneEmpty();
IColumn & out_data = *column_data.get();
if (column_fill)
{
const IColumn::Filter & fill = column_fill->getData();
size_t array_begin = 0;
size_t array_end = 0;
size_t begin = 0;
size_t end = 0;
out_data.reserve(in_data.size());
for (auto in_offset : in_offsets)
{
array_end = in_offset;
for (; end < array_end; ++end)
{
if (end + 1 == array_end || fill[end + 1] != fill[begin])
{
if (fill[begin])
out_data.insertRangeFrom(in_data, begin, end + 1 - begin);
else
{
if constexpr (reverse)
{
if (end + 1 == array_end)
out_data.insertManyFrom(in_data, end, end + 1 - begin);
else
out_data.insertManyFrom(in_data, end + 1, end + 1 - begin);
}
else
{
if (begin == array_begin)
out_data.insertManyFrom(in_data, array_begin, end + 1 - begin);
else
out_data.insertManyFrom(in_data, begin - 1, end + 1 - begin);
}
}
begin = end + 1;
}
}
array_begin = array_end;
}
}
else
{
const auto * column_fill_const = checkAndGetColumnConst<ColumnUInt8>(&*mapped);
if (!column_fill_const)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Unexpected type of cut column");
if (column_fill_const->getValue<UInt8>())
return ColumnArray::create(
array.getDataPtr(),
array.getOffsetsPtr());
size_t array_begin = 0;
size_t array_end = 0;
out_data.reserve(in_data.size());
for (auto in_offset : in_offsets)
{
array_end = in_offset - 1;
if constexpr (reverse)
out_data.insertManyFrom(in_data, array_end, array_end + 1 - array_begin);
else
out_data.insertManyFrom(in_data, array_begin, array_end + 1 - array_begin);
array_begin = array_end + 1;
}
}
return ColumnArray::create(
std::move(column_data),
array.getOffsetsPtr()
);
}
};
struct NameArrayFill { static constexpr auto name = "arrayFill"; };
struct NameArrayReverseFill { static constexpr auto name = "arrayReverseFill"; };
using FunctionArrayFill = FunctionArrayMapped<ArrayFillImpl<false>, NameArrayFill>;
using FunctionArrayReverseFill = FunctionArrayMapped<ArrayFillImpl<true>, NameArrayReverseFill>;
REGISTER_FUNCTION(ArrayFill)
{
factory.registerFunction<FunctionArrayFill>();
factory.registerFunction<FunctionArrayReverseFill>();
}
}
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