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Commitf01157e

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Further simplify nbtree high key truncation.
Commit7c2dbc6 reorganized _bt_truncate() in a way that enables afurther simplification that I (pgeoghegan) missed: Since we mark thetuple that is returned to the caller as a pivot tuple before the pointwhere its heap TID is set as of7c2dbc6, it is possible to use the highlevel BTreeTupleGetHeapTID() inline function to get an item pointer. Doit that way now. This approach is clearer and more maintainable.
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‎src/backend/access/nbtree/nbtutils.c

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2251,6 +2251,7 @@ _bt_truncate(Relation rel, IndexTuple lastleft, IndexTuple firstright,
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tidpivot->t_info |=newsize;
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BTreeTupleSetNAtts(tidpivot,nkeyatts);
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BTreeTupleSetAltHeapTID(tidpivot);
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pivotheaptid=BTreeTupleGetHeapTID(tidpivot);
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/*
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* Lehman & Yao use lastleft as the leaf high key in all cases, but don't
@@ -2259,8 +2260,6 @@ _bt_truncate(Relation rel, IndexTuple lastleft, IndexTuple firstright,
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* TID. (This is also the closest value to negative infinity that's
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* legally usable.)
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*/
2262-
pivotheaptid= (ItemPointer) ((char*)tidpivot+newsize-
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sizeof(ItemPointerData));
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ItemPointerCopy(BTreeTupleGetMaxHeapTID(lastleft),pivotheaptid);
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/*

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