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

I noticed while testing some other stuff that the CHECK_ENCODING_ROUNDTRIPlogic in ginCompressPostingList could account for over 50% of the runtimeof an INSERT with a GIN index. While that's not relevant to productionperformance, it's still kind of annoying in a debug build. Replacingthe loop around short memcmp's with one long memcmp works just as welland is significantly faster, at least on my machine.

1 parent7e39b96 commitea7daceCopy full SHA for ea7dace

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src/backend/access/gin
- ginpostinglist.c

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`‎src/backend/access/gin/ginpostinglist.c‎`

Lines changed: 1 addition & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -266,11 +266,9 @@ ginCompressPostingList(const ItemPointer ipd, int nipd, int maxsize,`
`266`	`266`	`{`
`267`	`267`	`intndecoded;`
`268`	`268`	`ItemPointertmp=ginPostingListDecode(result,&ndecoded);`
`269`		`-inti;`
`270`	`269`
`271`	`270`	`Assert(ndecoded==totalpacked);`
`272`		`-for (i=0;i<ndecoded;i++)`
`273`		`-Assert(memcmp(&tmp[i],&ipd[i],sizeof(ItemPointerData))==0);`
	`271`	`+Assert(memcmp(tmp,ipd,ndecoded*sizeof(ItemPointerData))==0);`
`274`	`272`	`pfree(tmp);`
`275`	`273`	`}`
`276`	`274`	`#endif`

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Commitea7dace

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`‎src/backend/access/gin/ginpostinglist.c‎`

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