Re: hi,is it dangerous to only use tuple pointer through heap_getnext()?

Excerpts from sunpeng's message of vie may 14 19:15:47 -0400 2010:
> hi,i use these codes to store only pointer of tuple :
> HeapTuple *tuple;
>     tuple = heap_getnext(pHeapScanDesc,ForwardScanDirection);
>     while(tuple){
>         //[1#]here i only store the pointer of tuple in an array for later
> using,that means i don't retrive attribute data from this tuple ,is this ok?

No, this is not safe.  The buffer is unpinned after heap_getnext walks
to the next buffer, and thus could be used for a different page.

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