Fix not expanded problem when passing an Array object as argument to the where method using composed_of column.

[orekyuu]

Fixes #31723

david_balance = customers(:david).balance
Customer.where(balance: [david_balance]).to_sql

# Before: WHERE `customers`.`balance` = NULL
# After : WHERE `customers`.`balance` = 50

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[kamipo]

Can you more exercise tests for customer.address (mapping size: 2)?
Looks like this only work in case of mapping size: 1.

[orekyuu]

@kamipo Added test with multiple mappings.

[kamipo]

Originally, if mapping size is 1, Customer.where(fullname: customer.fullname.to_s) treated as Customer.where(name: customer.fullname.to_s). If mapping size is more than 1, not allowed as invalid value.

In this PR, Customer.where(address: customer.address.country) will be treated as Customer.where(address_street: customer.address.country, address_city: customer.address.country, address_country: customer.address.country).
At least it should not be changed to fix #31723.