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Simplify/speed up assertion cross-check in ginCompressPostingList(). 

I noticed while testing some other stuff that the CHECK_ENCODING_ROUNDTRIP
logic in ginCompressPostingList could account for over 50% of the runtime
of an INSERT with a GIN index.  While that's not relevant to production
performance, it's still kind of annoying in a debug build.  Replacing
the loop around short memcmp's with one long memcmp works just as well
and is significantly faster, at least on my machine.
This commit is contained in:
Tom Lane 2020-03-07 13:31:17 -05:00
parent 7e39b968f1
commit ea7dace2aa
1 changed files with 1 additions and 3 deletions
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4
src/backend/access/gin/ginpostinglist.c
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@ -266,11 +266,9 @@ ginCompressPostingList(const ItemPointer ipd, int nipd, int maxsize,
{
int ndecoded;
ItemPointer tmp = ginPostingListDecode(result, &ndecoded);
int i;
Assert(ndecoded == totalpacked);
for (i = 0; i < ndecoded; i++)
Assert(memcmp(&tmp[i], &ipd[i], sizeof(ItemPointerData)) == 0);
Assert(memcmp(tmp, ipd, ndecoded * sizeof(ItemPointerData)) == 0);
pfree(tmp);
}
#endif