[HACKERS] When is a record NULL?

[David E. Wheeler]

How can a record be neither NULL or NOT NULL?

    try=# select ROW(1, NULL) IS NULL;
     ?column?
    ----------
     f
    (1 row)
    try=# select ROW(1, NULL) IS NOT NULL;
     ?column?
    ----------
     f
    (1 row)

This makes it rather hard to tell, in PL/pgSQL, when I've fetched the  
last record from a cursor…

Best,

David
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