ALTER TABLE policy MODIFY spam_tag_level varchar(10) NULL;
ALTER TABLE policy MODIFY spam_tag2_level varchar(10) NULL;
ALTER TABLE policy MODIFY spam_kill_level varchar(10) NULL;
ALTER TABLE policy MODIFY spam_dsn_cutoff_level varchar(10) NULL;
ALTER TABLE policy MODIFY spam_quarantine_cutoff_level varchar(10) NULL;

I also want to know if these modifications will affect some other things?

You will have to see.

In addition, I can see two more float values.

in TABLE msgs, spam_level float
and
in TABLE msgrcpt, bspam_level float

I did not alter these.
Should I need to alter in the following manner?

Does not seem necessary. As far as I can tell, those fields are only written 
and never read.

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