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Commit77a1ba2

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In multi-insert, don't go into infinite loop on a huge tuple and fillfactor.
If a tuple is larger than page size minus space reserved for fillfactor,heap_multi_insert would never find a page that it fits in and repeatedly askfor a new page from RelationGetBufferForTuple. If a tuple is too large tofit on any page, taking fillfactor into account, RelationGetBufferForTuplewill always expand the relation. In a normal insert, heap_insert will acceptthat and put the tuple on the new page. heap_multi_insert, however, does afillfactor check of its own, and doesn't accept the newly-extended pageRelationGetBufferForTuple returns, even though there is no other choice tomake the tuple fit.Fix that by making the logic in heap_multi_insert more like the heap_insertlogic. The first tuple is always put on the page RelationGetBufferForTuplegives us, and the fillfactor check is only applied to the subsequent tuples.Report from David Gould, although I didn't use his patch.
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‎src/backend/access/heap/heapam.c‎

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2172,8 +2172,12 @@ heap_multi_insert(Relation relation, HeapTuple *tuples, int ntuples,
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/* NO EREPORT(ERROR) from here till changes are logged */
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START_CRIT_SECTION();
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2175-
/* Put as many tuples as fit on this page */
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for (nthispage=0;ndone+nthispage<ntuples;nthispage++)
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/*
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* RelationGetBufferForTuple has ensured that the first tuple fits.
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* Put that on the page, and then as many other tuples as fit.
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*/
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RelationPutHeapTuple(relation,buffer,heaptuples[ndone]);
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for (nthispage=1;ndone+nthispage<ntuples;nthispage++)
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{
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HeapTupleheaptup=heaptuples[ndone+nthispage];
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