Table column type error using ARRAY_AGG in SQLScript

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When activating codes above, I got an error message ("line 41" below means "line 16"):

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Does anyone know how to fix it?

By the way, what are the ways if I want to add one new column in table variable in SQLScript functions (say, "temp_major_list" variable above)?

I try to ARRAY_AGG the existing two columns in the table variable first, and build one more column in array, and finally UNNEST all three arrays into a new table variable.

Any other suggestions?

Thank you and best regards,

Angel