Hello,
I try to write my first patch. It is too early to tell more about it,
but I am just fiddling around with some prototypes.
Can someone tell me, how I can compare two datum fields, when I do not
know the data type in advance inside an executor function?
For example, "x less than y" where x and y are of various types that
form intervals. I have found the method ExecTuplesMatch, but it is only
for equality comparison, I think. Another one is ApplySortComparator...
maybe that's the correct way to go?
Some code to make things clearer...
Datum x = heap_getattr(out->tts_tuple,
node->xpos,
out->tts_tupleDescriptor,
&isNull1);
Datum y = slot_getattr(curr, node->ypos, &isNull2);
if (compareDatumWithCorrectMethod(x,y) < 0)
{
/* do something */
}
Thx,
Peter
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