Commit7dbe290

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Add CREATE INDEX deduplication assertions.

Add two assertions that verify the assumptions about posting list tuplespace accounting and suffix truncation made within nbtsort.c.

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Original file line number	Diff line number	Diff line change
`@@ -908,6 +908,7 @@ _bt_buildadd(BTWriteState wstate, BTPageState state, IndexTuple itup,`
`908`	`908`	`* assume that suffix truncation neither enlarges nor shrinks new high key`
`909`	`909`	`* when applying soft limit, except when last tuple has a posting list.)`
`910`	`910`	`*/`
	`911`	`+Assert(last_truncextra==0\|\|isleaf);`
`911`	`912`	`if (pgspc<itupsz+ (isleaf ?MAXALIGN(sizeof(ItemPointerData)) :0)\|\|`
`912`	`913`	`(pgspc+last_truncextra<state->btps_full&&last_off>P_FIRSTKEY))`
`913`	`914`	`{`
`@@ -983,6 +984,7 @@ _bt_buildadd(BTWriteState wstate, BTPageState state, IndexTuple itup,`
`983`	`984`	`ii=PageGetItemId(opage,OffsetNumberPrev(last_off));`
`984`	`985`	`lastleft= (IndexTuple)PageGetItem(opage,ii);`
`985`	`986`
	`987`	`+Assert(IndexTupleSize(oitup)>last_truncextra);`
`986`	`988`	`truncated=_bt_truncate(wstate->index,lastleft,oitup,`
`987`	`989`	`wstate->inskey);`
`988`	`990`	`if (!PageIndexTupleOverwrite(opage,P_HIKEY, (Item)truncated,`

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