database - mysql - add columns to a table or create new table and join -

i have following setup:

a table n columns contain let's say... pizza details. there 4 kind of pizzas @ point until pizzas had same details, each detail saved in column.

but new kind of pizza called super pizza appeared, has 2 more types of details needs saved.

there 2 ways (that can think about):

1. add columns existing table, , leave them blank/null/whatever rest of 4 pizzas types

2. create new table 3 columns (idpizza, newdetail1 , newdetail2), save pizza rest of pizzas, , when data join 2 tables

first option has disadvantage keep useless data pizzas except new type (80% of table @ average pizzas distribution).

second option has disadvantage each time new kind of pizza need make join. db kind of "messy"... having part of pizza element stored in table , other part in another.

i know matter of taste how think should proceed? incline bit first option second opinion welcomed.

as note: there lots of entries in tables (like tens of thousands).

second note (based on answer): can't refactor "pizza" table, add it.

i suggested use first option. because 2nd option reserve more resources 1st option , take more time process.

as disadvantages of 1st option have mentioned quite obvious,but when need more column add new existing table.