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#include <Functions/array/arrayExists.h>
#include <Functions/FunctionFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_COLUMN;
}
ColumnPtr ArrayExistsImpl::execute(const ColumnArray & array, ColumnPtr mapped)
{
const ColumnUInt8 * column_filter = typeid_cast<const ColumnUInt8 *>(&*mapped);
if (!column_filter)
{
const auto * column_filter_const = checkAndGetColumnConst<ColumnUInt8>(&*mapped);
if (!column_filter_const)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Unexpected type of filter column");
if (column_filter_const->getValue<UInt8>())
{
const IColumn::Offsets & offsets = array.getOffsets();
auto out_column = ColumnUInt8::create(offsets.size());
ColumnUInt8::Container & out_exists = out_column->getData();
size_t pos = 0;
for (size_t i = 0; i < offsets.size(); ++i)
{
out_exists[i] = offsets[i] - pos > 0;
pos = offsets[i];
}
return out_column;
}
else
return DataTypeUInt8().createColumnConst(array.size(), 0u);
}
const IColumn::Filter & filter = column_filter->getData();
const IColumn::Offsets & offsets = array.getOffsets();
auto out_column = ColumnUInt8::create(offsets.size());
ColumnUInt8::Container & out_exists = out_column->getData();
size_t pos = 0;
for (size_t i = 0; i < offsets.size(); ++i)
{
UInt8 exists = 0;
for (; pos < offsets[i]; ++pos)
{
if (filter[pos])
{
exists = 1;
pos = offsets[i];
break;
}
}
out_exists[i] = exists;
}
return out_column;
}
REGISTER_FUNCTION(ArrayExists)
{
factory.registerFunction<FunctionArrayExists>();
}
}
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