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mulit_index class has three methods (emplace, modify, erase) to update a table.

emplace and modify methods need to select ram_payer. But erase method doesn't need to select it.

I think these methods need it because these change table. So why don't need ram_payer for erase method in mulit_index class?

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The emplace and modify methods need to know who is paying for the row that is being added/modified so that their accounts can be charged. When you call erase, however, you aren't storing anything. Instead, you are removing a row. In this case, EOS already knows who paid for that row and simply refunds the RAM cost to that account when the data is erased.

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