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Don't try to use a unopened relation
Commit 4c9d0901 mistakenly introduced a call to TransferPredicateLocksToHeapRelation() on an index relation that had been closed a few lines above. Moving up an index_open() call that's below is enough to fix the problem. Discovered by me while testing an unrelated patch.
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@ -1464,6 +1464,8 @@ index_drop(Oid indexId, bool concurrent)
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* conflicts with existing predicate locks, so now is the time to move
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* them to the heap relation.
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*/
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userHeapRelation = heap_open(heapId, ShareUpdateExclusiveLock);
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userIndexRelation = index_open(indexId, ShareUpdateExclusiveLock);
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TransferPredicateLocksToHeapRelation(userIndexRelation);
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/*
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@ -1473,9 +1475,6 @@ index_drop(Oid indexId, bool concurrent)
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*/
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indexRelation = heap_open(IndexRelationId, RowExclusiveLock);
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userHeapRelation = heap_open(heapId, ShareUpdateExclusiveLock);
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userIndexRelation = index_open(indexId, ShareUpdateExclusiveLock);
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tuple = SearchSysCacheCopy1(INDEXRELID,
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ObjectIdGetDatum(indexId));
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if (!HeapTupleIsValid(tuple))
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