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why I need col. def. list with setof record? - Mailing list pgsql-hackers

From Pavel Stehule
Subject why I need col. def. list with setof record?
Date
Msg-id Pine.LNX.4.44.0312051455100.8131-100000@kix.fsv.cvut.cz
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Hello
I know so I need to use column definition list when I have SRF 
function without def of own type. But I don't understand why. In my SRF 
function I specify all informations about columns?
 TupleDescInitEntry (tupdesc, 1, "idn", INT4OID, -1, 0, false); TupleDescInitEntry (tupdesc, 2, "idv", VARCHAROID, -1,
0,false);
 

Why I have to duplicate to?

Thank You
Pavel Stehule

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