**Use case**

Viewing binary data such as bitmasks, hashes, internal representation of IEEE-754 numbers, etc.
Mostly for debugging.

**Describe the solution you'd like**

Similar to `hex`/`unhex`.

`bin` - returns a string with `0` and `1`. Bits are in "human" order, most significant first. Most significant zero bits are not printed (except the case with single zero).

**Describe alternatives you've considered**

Now I have to run interactive `python` from command line, but I will be more happy using ClickHouse.

**Caveats**

The name `bin` may suggest that the function will "split data into bins" but it is completely unrelated.
return true;
        }
        else
        {
            return false;
        }
    }
    bool useDefaultImplementationForConstants() const override { return true; }
    ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t ) const override
    {
        const IColumn * column = arguments[0].column.get();
        ColumnPtr res_column;
        if (tryExecuteUInt<UInt8>(column, res_column) ||
            tryExecuteUInt<UInt16>(column, res_column) ||
            tryExecuteUInt<UInt32>(column, res_column) ||
            tryExecuteUInt<UInt64>(column, res_column) ||
            tryExecuteString(column, res_column) ||
            tryExecuteFixedString(column, res_column) ||
            tryExecuteFloat<Float32>(column, res_column) ||
            tryExecuteFloat<Float64>(column, res_column) ||
            tryExecuteDecimal<Decimal32>(column, res_column) ||
            tryExecuteDecimal<Decimal64>(column, res_column) ||
            tryExecuteDecimal<Decimal128>(column, res_column))
            return res_column;
        throw Exception("Illegal column " + arguments[0].column->getName()
                        + " of argument of function " + getName(),
                        ErrorCodes::ILLEGAL_COLUMN);
    }
};
class FunctionUnhex : public IFunction