the difference between OLD.col and $_TD{old}{col} - Mailing list pgsql-novice

From Jignesh Shah
Subject the difference between OLD.col and $_TD{old}{col}
Date
Msg-id c11950270909170449g487287b8led918cef201906d7@mail.gmail.com
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List pgsql-novice
Hi,
 
Could anyone please tell me in perl trigger, what is the difference between OLD."col" or NEW."col"  and $_TD{old}{col} or $_TD{new}{col} values.
 
Thanks,
Jignesh

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