From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | "John Hansen" <john(at)geeknet(dot)com(dot)au> |
Cc: | "Pgsql Hackers" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: PG_FREE_IF_COPY() |
Date: | 2005-06-14 14:27:21 |
Message-ID: | 28383.1118759241@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
"John Hansen" <john(at)geeknet(dot)com(dot)au> writes:
> Given the following snippet:
> HeapTupleHeader tuple;
> Datum temp;
> bool isnull;
> tuple = PG_GETARG_HEAPTUPLEHEADER(0);
> temp = GetAttributeByName(tuple, "data", &isnull);
> When using this for a btree operator functions, you need to
> PG_FREE_IF_COPY(?,?);
> Which of the above parameters need I free?
It'd probably be wise to do a FREE_IF_COPY on the tuple.
GetAttributeByName, however, hasn't copied anything (if it's
a pass-by-ref type you'll just get a pointer into the tuple).
If you do a copy further down that might be a reason to free
something, but this code alone isn't making a copy.
regards, tom lane
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