ClickHouse/dbms/src/Functions/arrayAll.cpp
Amos Bird 3cf2177268 Flexible fields assignment
Field f;

before:

f = Int64(-42);

after:

f = -42;
2018-10-24 08:47:33 +08:00

90 lines
2.7 KiB
C++

#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnsNumber.h>
#include <Functions/FunctionArrayMapped.h>
#include <Functions/FunctionFactory.h>
namespace DB
{
/** arrayAll(x1,...,xn -> expression, array1,...,arrayn) - is the expression true for all elements of the array.
* An overload of the form f(array) is available, which works in the same way as f(x -> x, array).
*/
struct ArrayAllImpl
{
static bool needBoolean() { return true; }
static bool needExpression() { return false; }
static bool needOneArray() { return false; }
static DataTypePtr getReturnType(const DataTypePtr & /*expression_return*/, const DataTypePtr & /*array_element*/)
{
return std::make_shared<DataTypeUInt8>();
}
static ColumnPtr execute(const ColumnArray & array, ColumnPtr mapped)
{
const ColumnUInt8 * column_filter = typeid_cast<const ColumnUInt8 *>(&*mapped);
if (!column_filter)
{
auto column_filter_const = checkAndGetColumnConst<ColumnUInt8>(&*mapped);
if (!column_filter_const)
throw Exception("Unexpected type of filter column", ErrorCodes::ILLEGAL_COLUMN);
if (column_filter_const->getValue<UInt8>())
return DataTypeUInt8().createColumnConst(array.size(), 1u);
else
{
const IColumn::Offsets & offsets = array.getOffsets();
auto out_column = ColumnUInt8::create(offsets.size());
ColumnUInt8::Container & out_all = out_column->getData();
size_t pos = 0;
for (size_t i = 0; i < offsets.size(); ++i)
{
out_all[i] = offsets[i] == pos;
pos = offsets[i];
}
return out_column;
}
}
const IColumn::Filter & filter = column_filter->getData();
const IColumn::Offsets & offsets = array.getOffsets();
auto out_column = ColumnUInt8::create(offsets.size());
ColumnUInt8::Container & out_all = out_column->getData();
size_t pos = 0;
for (size_t i = 0; i < offsets.size(); ++i)
{
UInt8 all = 1;
for (; pos < offsets[i]; ++pos)
{
if (!filter[pos])
{
all = 0;
pos = offsets[i];
break;
}
}
out_all[i] = all;
}
return out_column;
}
};
struct NameArrayAll { static constexpr auto name = "arrayAll"; };
using FunctionArrayAll = FunctionArrayMapped<ArrayAllImpl, NameArrayAll>;
void registerFunctionArrayAll(FunctionFactory & factory)
{
factory.registerFunction<FunctionArrayAll>();
}
}